CriticalCVE-2016-5018

    Apache Tomcat: security vulnerability (CVE-2016-5018)

    Published Last modified Sources: CVE.org, OSV

    What is affected, what to do

    In Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 a malicious web application was able to bypass a configured SecurityManager via a Tomcat utility method that was accessible to web applications.

    An exploit is publicly available. The available sources name no fixed version. Check the vendor guidance in the references below.

    Affected
    • Apache Tomcat eq 9.0.0.M1 to 9.0.0.M9..9.0.0.M1 to 9.0.0.M9
    • Apache Tomcat eq 8.5.0 to 8.5.4..8.5.0 to 8.5.4
    • Apache Tomcat eq 8.0.0.RC1 to 8.0.36..8.0.0.RC1 to 8.0.36
    • Apache Tomcat eq 7.0.0 to 7.0.70..7.0.0 to 7.0.70
    • Apache Tomcat eq 6.0.0 to 6.0.45..6.0.0 to 6.0.45

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

    Metrics

    9.1

    Priority

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

    Source: NVD, CVSS v3

    9.1

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: CVE.org, OSV

    10.3 %

    EPSS score

    Elevated — model estimates 10-50% exploitation likelihood.

    Source: FIRST EPSS, percentile 95.7

    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
    118.74 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
    PoC (publicly reported)
    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
    9.1 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
    9.1
    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
    10.3 %
    Elevated — model estimates 10-50% 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
    95.7
    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

    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

    In Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 a malicious web application was able to bypass a configured SecurityManager via a Tomcat utility method that was accessible to web applications.

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

    Affected products

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

    Affected products
    Affected versionsFixed in
    Apache Software FoundationApache Tomcat
    • 8.5.0 to 8.5.4
    • 8.0.0.RC1 to 8.0.36
    • 7.0.0 to 7.0.70
    • 6.0.0 to 6.0.45
    • 9.0.0.M1 to 9.0.0.M9
    • —
    • —
    • —
    • —
    • —
    apachetomcat
    • 9.0.0
    • 6.0.0 – ≤ 6.0.45
    • 8.0 – ≤ 8.0.36
    • 8.5.0 – ≤ 8.5.4
    • 7.0.0 – ≤ 7.0.70
    • —
    • —
    • —
    • —
    • —
    netapponcommand_insight
    • —
    • —
    netapponcommand_shift
    • —
    • —
    netappsnap_creator_framework
    • —
    • —
    oracletekelec_platform_distribution
    • 7.4.0 – ≤ 7.7.1
    • —
    redhatjboss_enterprise_application_platform
    • 6.4
    • —
    redhatjboss_enterprise_web_server
    • 3.0.0
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebiandebian_linux8.0
    Linuxredhatenterprise_linux_desktop7.0
    Linuxredhatenterprise_linux_eus7.4
    Linuxredhatenterprise_linux_eus7.5
    Linuxredhatenterprise_linux_eus7.6
    Linuxredhatenterprise_linux_eus7.7
    Linuxredhatenterprise_linux_server7.0
    Linuxredhatenterprise_linux_server_aus7.4
    Linuxredhatenterprise_linux_server_aus7.6
    Linuxredhatenterprise_linux_server_aus7.7
    Linuxredhatenterprise_linux_server_tus7.6
    Linuxredhatenterprise_linux_server_tus7.7
    Linuxredhatenterprise_linux_workstation7.0
    Linuxcanonicalubuntu_linux16.04

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    Packet StormTomcat 9.0.0.M1 Sandbox Escape (opens in a new tab)packetstormsecurity.comPoC (publicly reported)reported, not verified—

    References & sources

    • NVD (NIST)vuln/detail/CVE-2016-5018advisory
    • github.comapache/tomcat/commit/648122fef84d3b43223e0b5ae668f84719dada0aweb
    • github.comapache/tomcat/commit/890a2f681ed2f3461b27983d7da9737375ff2ae4web
    • github.comapache/tomcat/commit/a6b1ebc246b91b854237e5aad3dfd2b5460ea282web
    • lists.apache.org[announce] 20161027 [SECURITY] CVE-2016-5018 Apache Tomcat Security Manager Bypassweb, Mailing list, x_refsource_MLIST
    • lists.apache.orgthread.html/9b3a63a20c87179815fdea14f6766853bafe79a0042dc0b4aa8…web
    • lists.apache.org[tomcat-dev] 20190325 svn commit: r1856174 [24/29] - in /tomcat/site/trunk: docs/ xdocs/ xdocs/stylesheets/web, Mailing list, x_refsource_MLIST
    • lists.apache.orgthread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83…web
    • lists.apache.org[tomcat-dev] 20190415 svn commit: r1857582 [16/22] - in /tomcat/site/trunk: docs/ xdocs/stylesheets/web, Mailing list, x_refsource_MLIST
    • lists.apache.orgthread.html/b84ad1258a89de5c9c853c7f2d3ad77e5b8b2930be9e132d5ce…web
    • lists.apache.org[tomcat-dev] 20190319 svn commit: r1855831 [23/30] - in /tomcat/site/trunk: ./ docs/ xdocs/web, Mailing list, x_refsource_MLIST
    • lists.apache.orgthread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab30336…web
    • lists.apache.org[tomcat-dev] 20200203 svn commit: r1873527 [23/30] - /tomcat/site/trunk/docs/web, Mailing list, x_refsource_MLIST
    • lists.apache.orgthread.html/r03c597a64de790ba42c167efacfa23300c3d6c9fe589ab87fe…web
    • lists.apache.org[tomcat-dev] 20200213 svn commit: r1873980 [26/34] - /tomcat/site/trunk/docs/web, Mailing list, x_refsource_MLIST
    • lists.apache.orgthread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae…web
    • lists.apache.org[tomcat-dev] 20200213 svn commit: r1873980 [27/34] - /tomcat/site/trunk/docs/web, Mailing list, x_refsource_MLIST
    • lists.apache.orgthread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cb…web
    • security.netapp.comadvisory/ntap-20180605-0001web
    • usn.ubuntu.com4557-1web

    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).

    1. Record modifiedApache

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      http://packetstormsecurity.com/files/155873/Tomcat-9.0.0.M1-Sandbox-Escape.html
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      http://www.debian.org/security/2016/dsa-3720
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      https://security.netapp.com/advisory/ntap-20180605-0001/
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      https://usn.ubuntu.com/4557-1/
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      https://www.oracle.com/security-alerts/cpuoct2021.html
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      https://security.netapp.com/advisory/ntap-20180605-0001/ Types: Third Party Advisory
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      Source identifier: security@apache.org

    2. Record modifiedCISA ADP

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

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      {"id":"CVE-2016-5018","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-08T21:05:00.528589Z"}

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

    3. Record modifiedCVE Program

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      https://lists.apache.org/thread.html/845312a10aabbe2c499fca94003881d2c79fc993d85f34c1f5c77424%40%3Cdev.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/9b3a63a20c87179815fdea14f6766853bafe79a0042dc0b4aa878a9e%40%3Cannounce.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/b84ad1258a89de5c9c853c7f2d3ad77e5b8b2930be9e132d5cef6b95%40%3Cdev.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab3033662cfb%40%3Cdev.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/r03c597a64de790ba42c167efacfa23300c3d6c9fe589ab87fe02859c%40%3Cdev.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae9f3a9b%40%3Cdev.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
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      https://security.netapp.com/advisory/ntap-20180605-0001/
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      https://usn.ubuntu.com/4557-1/
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      https://www.oracle.com/security-alerts/cpuoct2021.html
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      http://packetstormsecurity.com/files/155873/Tomcat-9.0.0.M1-Sandbox-Escape.html
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      http://rhn.redhat.com/errata/RHSA-2017-0457.html
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      http://rhn.redhat.com/errata/RHSA-2017-1551.html
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      http://www.debian.org/security/2016/dsa-3720
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      http://www.securityfocus.com/bid/93942
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      http://www.securitytracker.com/id/1037142
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      http://www.securitytracker.com/id/1038757
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      https://access.redhat.com/errata/RHSA-2017:0455
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      https://access.redhat.com/errata/RHSA-2017:0456
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      https://access.redhat.com/errata/RHSA-2017:1548
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      https://access.redhat.com/errata/RHSA-2017:1550
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      https://access.redhat.com/errata/RHSA-2017:2247
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      https://lists.apache.org/thread.html/9b3a63a20c87179815fdea14f6766853bafe79a0042dc0b4aa878a9e%40%3Cannounce.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae9f3a9b%40%3Cdev.tomcat.apache.org%3E
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      https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
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      https://security.netapp.com/advisory/ntap-20180605-0001/
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      https://usn.ubuntu.com/4557-1/
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      https://www.oracle.com/security-alerts/cpuoct2021.html
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      Reference typeremoved
      http://packetstormsecurity.com/files/155873/Tomcat-9.0.0.M1-Sandbox-Escape.html Types: Exploit, Third Party Advisory, VDB Entry
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      Reference typeremoved
      http://rhn.redhat.com/errata/RHSA-2017-0457.html Types: Third Party Advisory
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      http://rhn.redhat.com/errata/RHSA-2017-1551.html Types: Third Party Advisory
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      http://www.debian.org/security/2016/dsa-3720 Types: Third Party Advisory
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      http://www.securityfocus.com/bid/93942 Types: Broken Link
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      http://www.securitytracker.com/id/1037142 Types: Broken Link
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      http://www.securitytracker.com/id/1038757 Types: Broken Link
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      https://access.redhat.com/errata/RHSA-2017:0455 Types: Third Party Advisory
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      https://access.redhat.com/errata/RHSA-2017:0456 Types: Third Party Advisory
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      https://access.redhat.com/errata/RHSA-2017:1548 Types: Third Party Advisory
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      https://access.redhat.com/errata/RHSA-2017:1549 Types: Third Party Advisory
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      https://access.redhat.com/errata/RHSA-2017:1550 Types: Third Party Advisory
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      https://access.redhat.com/errata/RHSA-2017:1552 Types: Third Party Advisory
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      Reference typeremoved
      https://access.redhat.com/errata/RHSA-2017:2247 Types: Third Party Advisory
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      Reference typeremoved
      https://security.netapp.com/advisory/ntap-20180605-0001/ Types: Third Party Advisory
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      Reference typeremoved
      https://usn.ubuntu.com/4557-1/ Types: Third Party Advisory
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      Reference typeremoved
      https://www.oracle.com/security-alerts/cpuoct2021.html Types: Patch, Third Party Advisory
      —

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

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