CriticalCVE-2016-9841

zlib: security vulnerability (CVE-2016-9841)

Published 23.05.2017Last modified 08.10.2026Sources: CVE.org, OSV

What is affected, what to do

inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.

Update zlib to version 1.2.9, Apple iPhone OS to version 11, Apple Mac OS X to version 10.13.0.

Affected: zlib lt 1.2.0..1.2.9
openSUSE Leap eq 42.1..42.1
openSUSE Leap eq 42.2..42.2
OpenSUSE eq 13.2..13.2
Debian Linux eq 8.0..8.0
Canonical Ubuntu Linux eq 16.04..16.04
Canonical Ubuntu Linux eq 18.04..18.04
Oracle Database Server eq 18c..18c
Oracle JDK eq 1.6.0..1.6.0
Oracle JDK eq 1.7.0..1.7.0
Oracle JDK eq 1.8.0..1.8.0
Oracle JRE eq 1.6.0..1.6.0
Oracle JRE eq 1.7.0..1.7.0
Oracle JRE eq 1.8.0..1.8.0
Oracle MySQL Server lte 5.5.0..5.5.61
Oracle MySQL Server lte 5.6.0..5.6.41
Oracle MySQL Server lte 5.7.0..5.7.23
Oracle MySQL Server lte 8.0.0..8.0.12
Red Hat Satellite eq 5.8..5.8
Redhat Enterprise Linux Desktop eq 6.0..6.0
Redhat Enterprise Linux Desktop eq 7.0..7.0
Red Hat Enterprise Linux Extended Update Support (EUS) eq 7.4..7.4
Red Hat Enterprise Linux Extended Update Support (EUS) eq 7.5..7.5
Redhat Enterprise Linux Server eq 6.0..6.0
Redhat Enterprise Linux Server eq 7.0..7.0
Redhat Enterprise Linux Workstation eq 6.0..6.0
Redhat Enterprise Linux Workstation eq 7.0..7.0
Apple iPhone OS lt *..11
Apple Mac OS X lt 10.0.0..10.13.0
Apple tvOS lt *..11.0
Apple watchOS lt *..4
Kernel gte 7.3..*
Kernel gte 9.5..*
NetApp E-Series SANtricity OS Controller lte 11.0.0..11.70.1
NetApp OnCommand Unified Manager lte *..7.1
NetApp VASA Provider for Clustered Data ONTAP gte 7.2..*
Node lte 4.0.0..4.1.2
Node lt 4.2.0..4.8.2
Node lte 6.0.0..6.8.1
Node lt 6.9.0..6.10.2
Node lt 7.0.0..7.6.0
Fixed in: zlib 1.2.9
Apple iPhone OS 11
Apple Mac OS X 10.13.0
Apple tvOS 11.0
Apple watchOS 4
Node 4.8.2
Node 6.10.2
Node 7.6.0

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

9.8

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

9.8

CVSS v3

Severity Critical on the scale from 0 to 10.

Source: CVE.org, OSV

7.6 %

EPSS score

Moderate — model estimates 1-10% exploitation likelihood.

Source: FIRST EPSS, percentile 94.5

Show all metrics

Severity: Critical
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 120.41 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 9.8 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 9.8
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 7.6 %; Moderate — model estimates 1-10% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 94.5; Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 23.05.2017

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.

Source: cvelistv5, OSV (Open Source Vulnerabilities), NVD (NIST)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
netapp	active_iq_unified_manager	`≥ 9.5` `≥ 7.3`	— —
netapp	cloud_backup	`—`	—
netapp	e-series_santricity_management	`—`	—
netapp	e-series_santricity_os_controller	`11.0.0 – ≤ 11.70.1`	—
netapp	e-series_santricity_storage_manager	`—`	—
netapp	e-series_santricity_web_services	`—`	—
netapp	hci_storage_node	`—`	—
netapp	oncommand_balance	`—`	—
netapp	oncommand_insight	`—`	—
netapp	oncommand_performance_manager	`—`	—
netapp	oncommand_shift	`—`	—
netapp	oncommand_unified_manager	`≤ 7.1` `—`	— —
netapp	oncommand_workflow_automation	`—`	—
netapp	snapmanager	`—`	—
netapp	solidfire	`—`	—
netapp	steelstore_cloud_integrated_storage	`—`	—
netapp	storage_replication_adapter_for_clustered_data_ontap	`—`	—
netapp	symantec_netbackup	`—`	—
netapp	vasa_provider_for_clustered_data_ontap	`≥ 7.2`	—
netapp	virtual_storage_console	`—`	—
nodejs	node.js	`6.0.0 – ≤ 6.8.1` `4.2.0 – < 4.8.2` `6.9.0 – < 6.10.2` `4.0.0 – ≤ 4.1.2` `7.0.0 – < 7.6.0`	— `4.8.2` `6.10.2` — `7.6.0`
oracle	database_server	`18c`	—
oracle	jdk	`1.8.0` `1.6.0` `1.7.0`	— — —
oracle	jre	`1.6.0` `1.8.0` `1.7.0`	— — —
oracle	mysql	`5.7.0 – ≤ 5.7.23` `5.5.0 – ≤ 5.5.61` `5.6.0 – ≤ 5.6.41` `8.0.0 – ≤ 8.0.12`	— — — —
redhat	satellite	`5.8`	—
zlib	zlib	`1.2.0 – < 1.2.9`	`1.2.9`

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	debian_linux	`8.0`
Linux	redhat	enterprise_linux_desktop	`6.0`
Linux	redhat	enterprise_linux_desktop	`7.0`
Linux	redhat	enterprise_linux_eus	`7.4`
Linux	redhat	enterprise_linux_eus	`7.5`
Linux	redhat	enterprise_linux_server	`6.0`
Linux	redhat	enterprise_linux_server	`7.0`
Linux	redhat	enterprise_linux_workstation	`6.0`
Linux	redhat	enterprise_linux_workstation	`7.0`
Linux	opensuse	leap	`42.1`
Linux	opensuse	leap	`42.2`
Linux	opensuse	opensuse	`13.2`
Linux	canonical	ubuntu_linux	`16.04`
Linux	canonical	ubuntu_linux	`18.04`
macOS	apple	mac_os_x	—
Mobile	apple	iphone_os	—
Other	apple	tvos	—
Other	apple	watchos	—

References & sources

bugs.python.orgissue29169report
access.redhat.comRHSA-2017:1221Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2017:1220Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2017:3047Vendor advisory, x_refsource_REDHAT
openwall.com[oss-security] 20161205 Re: CVE Request: zlib security issues found during auditMailing list, x_refsource_MLIST
securityfocus.com95131Vulnerability database, x_refsource_BID
access.redhat.comRHSA-2017:3046Vendor advisory, x_refsource_REDHAT
lists.opensuse.orgopenSUSE-SU-2017:0077Vendor advisory, x_refsource_SUSE
securitytracker.com1039596Vulnerability database, x_refsource_SECTRACK
security.gentoo.orgGLSA-201701-56Vendor advisory, x_refsource_GENTOO
securitytracker.com1039427Vulnerability database, x_refsource_SECTRACK
access.redhat.comRHSA-2017:1222Vendor advisory, x_refsource_REDHAT
lists.opensuse.orgopenSUSE-SU-2017:0080Vendor advisory, x_refsource_SUSE
access.redhat.comRHSA-2017:3453Vendor advisory, x_refsource_REDHAT
lists.opensuse.orgopenSUSE-SU-2016:3202Vendor advisory, x_refsource_SUSE
access.redhat.comRHSA-2017:2999Vendor advisory, x_refsource_REDHAT
lists.debian.org[debian-lts-announce] 20190324 [SECURITY] [DLA 1725-1] rsync security updateMailing list, x_refsource_MLIST
usn.ubuntu.comUSN-4246-1Vendor advisory, x_refsource_UBUNTU
lists.debian.org[debian-lts-announce] 20200129 [SECURITY] [DLA 2085-1] zlib security updateMailing list, x_refsource_MLIST
usn.ubuntu.comUSN-4292-1Vendor advisory, x_refsource_UBUNTU

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

08.10.2026Record modifiedopentext.com

New references:

and 8 more references

Show 66 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	http://lists.opensuse.org/opensuse-updates/2016-12/msg00127.html
Reference	added	—	http://lists.opensuse.org/opensuse-updates/2017-01/msg00050.html
Reference	added	—	http://lists.opensuse.org/opensuse-updates/2017-01/msg00053.html
Reference	added	—	http://www.openwall.com/lists/oss-security/2016/12/05/21
Reference	added	—	http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
Reference	added	—	http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
Reference	added	—	http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
Reference	added	—	http://www.securityfocus.com/bid/95131
Reference	added	—	http://www.securitytracker.com/id/1039427
Reference	added	—	http://www.securitytracker.com/id/1039596
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:1220
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:1221
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:1222
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:2999
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:3046
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:3047
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:3453
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=1402346
Reference	added	—	https://github.com/madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb
Reference	added	—	https://lists.debian.org/debian-lts-announce/2019/03/msg00027.html
Reference	added	—	https://lists.debian.org/debian-lts-announce/2020/01/msg00030.html
Reference	added	—	https://security.gentoo.org/glsa/201701-56
Reference	added	—	https://security.gentoo.org/glsa/202007-54
Reference	added	—	https://security.netapp.com/advisory/ntap-20171019-0001/
Reference	added	—	https://support.apple.com/HT208112
Reference	added	—	https://support.apple.com/HT208113
Reference	added	—	https://support.apple.com/HT208115
Reference	added	—	https://support.apple.com/HT208144
Reference	added	—	https://usn.ubuntu.com/4246-1/
Reference	added	—	https://usn.ubuntu.com/4292-1/
Reference	added	—	https://wiki.mozilla.org/images/0/09/Zlib-report.pdf
Reference	added	—	https://wiki.mozilla.org/MOSS/Secure_Open_Source/Completed#zlib
Reference	added	—	https://www.oracle.com/security-alerts/cpujul2020.html
Reference	removed	http://lists.opensuse.org/opensuse-updates/2016-12/msg00127.html	—
Reference	removed	http://lists.opensuse.org/opensuse-updates/2017-01/msg00050.html	—
Reference	removed	http://lists.opensuse.org/opensuse-updates/2017-01/msg00053.html	—
Reference	removed	http://www.openwall.com/lists/oss-security/2016/12/05/21	—
Reference	removed	http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html	—
Reference	removed	http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html	—
Reference	removed	http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html	—
Reference	removed	http://www.securityfocus.com/bid/95131	—
Reference	removed	http://www.securitytracker.com/id/1039427	—
Reference	removed	http://www.securitytracker.com/id/1039596	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:1220	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:1221	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:1222	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:2999	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:3046	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:3047	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:3453	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=1402346	—
Reference	removed	https://github.com/madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb	—
Reference	removed	https://lists.debian.org/debian-lts-announce/2019/03/msg00027.html	—
Reference	removed	https://lists.debian.org/debian-lts-announce/2020/01/msg00030.html	—
Reference	removed	https://security.gentoo.org/glsa/201701-56	—
Reference	removed	https://security.gentoo.org/glsa/202007-54	—
Reference	removed	https://security.netapp.com/advisory/ntap-20171019-0001/	—
Reference	removed	https://support.apple.com/HT208112	—
Reference	removed	https://support.apple.com/HT208113	—
Reference	removed	https://support.apple.com/HT208115	—
Reference	removed	https://support.apple.com/HT208144	—
Reference	removed	https://usn.ubuntu.com/4246-1/	—
Reference	removed	https://usn.ubuntu.com/4292-1/	—
Reference	removed	https://wiki.mozilla.org/images/0/09/Zlib-report.pdf	—
Reference	removed	https://wiki.mozilla.org/MOSS/Secure_Open_Source/Completed#zlib	—
Reference	removed	https://www.oracle.com/security-alerts/cpujul2020.html	—

Source identifier: security@opentext.com

08.10.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: yes

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2016-9841","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-08T21:06:20.818194Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

08.10.2026Record modifiedCVE Program

New references:

and 8 more references

Show 66 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	http://lists.opensuse.org/opensuse-updates/2016-12/msg00127.html
Reference	added	—	http://lists.opensuse.org/opensuse-updates/2017-01/msg00050.html
Reference	added	—	http://lists.opensuse.org/opensuse-updates/2017-01/msg00053.html
Reference	added	—	http://www.openwall.com/lists/oss-security/2016/12/05/21
Reference	added	—	http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
Reference	added	—	http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
Reference	added	—	http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
Reference	added	—	http://www.securityfocus.com/bid/95131
Reference	added	—	http://www.securitytracker.com/id/1039427
Reference	added	—	http://www.securitytracker.com/id/1039596
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:1220
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:1221
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:1222
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:2999
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:3046
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:3047
Reference	added	—	https://access.redhat.com/errata/RHSA-2017:3453
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=1402346
Reference	added	—	https://github.com/madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb
Reference	added	—	https://lists.debian.org/debian-lts-announce/2019/03/msg00027.html
Reference	added	—	https://lists.debian.org/debian-lts-announce/2020/01/msg00030.html
Reference	added	—	https://security.gentoo.org/glsa/201701-56
Reference	added	—	https://security.gentoo.org/glsa/202007-54
Reference	added	—	https://security.netapp.com/advisory/ntap-20171019-0001/
Reference	added	—	https://support.apple.com/HT208112
Reference	added	—	https://support.apple.com/HT208113
Reference	added	—	https://support.apple.com/HT208115
Reference	added	—	https://support.apple.com/HT208144
Reference	added	—	https://usn.ubuntu.com/4246-1/
Reference	added	—	https://usn.ubuntu.com/4292-1/
Reference	added	—	https://wiki.mozilla.org/images/0/09/Zlib-report.pdf
Reference	added	—	https://wiki.mozilla.org/MOSS/Secure_Open_Source/Completed#zlib
Reference	added	—	https://www.oracle.com/security-alerts/cpujul2020.html
Reference	removed	http://lists.opensuse.org/opensuse-updates/2016-12/msg00127.html	—
Reference	removed	http://lists.opensuse.org/opensuse-updates/2017-01/msg00050.html	—
Reference	removed	http://lists.opensuse.org/opensuse-updates/2017-01/msg00053.html	—
Reference	removed	http://www.openwall.com/lists/oss-security/2016/12/05/21	—
Reference	removed	http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html	—
Reference	removed	http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html	—
Reference	removed	http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html	—
Reference	removed	http://www.securityfocus.com/bid/95131	—
Reference	removed	http://www.securitytracker.com/id/1039427	—
Reference	removed	http://www.securitytracker.com/id/1039596	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:1220	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:1221	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:1222	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:2999	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:3046	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:3047	—
Reference	removed	https://access.redhat.com/errata/RHSA-2017:3453	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=1402346	—
Reference	removed	https://github.com/madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb	—
Reference	removed	https://lists.debian.org/debian-lts-announce/2019/03/msg00027.html	—
Reference	removed	https://lists.debian.org/debian-lts-announce/2020/01/msg00030.html	—
Reference	removed	https://security.gentoo.org/glsa/201701-56	—
Reference	removed	https://security.gentoo.org/glsa/202007-54	—
Reference	removed	https://security.netapp.com/advisory/ntap-20171019-0001/	—
Reference	removed	https://support.apple.com/HT208112	—
Reference	removed	https://support.apple.com/HT208113	—
Reference	removed	https://support.apple.com/HT208115	—
Reference	removed	https://support.apple.com/HT208144	—
Reference	removed	https://usn.ubuntu.com/4246-1/	—
Reference	removed	https://usn.ubuntu.com/4292-1/	—
Reference	removed	https://wiki.mozilla.org/images/0/09/Zlib-report.pdf	—
Reference	removed	https://wiki.mozilla.org/MOSS/Secure_Open_Source/Completed#zlib	—
Reference	removed	https://www.oracle.com/security-alerts/cpujul2020.html	—

Source identifier: af854a3a-2127-422b-91ae-364da2661108

08.10.2026Record modifiedSiemens ADP

New references:

https://cert-portal.siemens.com/productcert/html/ssa-470355.html

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-470355.html
Reference	removed	https://cert-portal.siemens.com/productcert/html/ssa-470355.html	—

Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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