MediumCVE-2022-20922

Cisco Firepower Threat Defense Software: Heap Inspection (CVE-2022-20922)

Published 10.11.2022Last modified 11.08.2026Sources: CVE.org

What is affected, what to do

The available sources name no fixed version. Check the vendor guidance in the references below.

Affected: Cisco Firepower Threat Defense Software eq 7.1.0..7.1.0
Cisco Firepower Threat Defense Software eq 7.1.0.1..7.1.0.1
Cisco Firepower Threat Defense Software eq 7.1.0.2..7.1.0.2
Cisco Firepower Threat Defense Software eq 7.2.0..7.2.0
Cisco Firepower Threat Defense Software eq 7.2.0.1..7.2.0.1
Cisco Umbrella Insights Virtual Appliance eq 1.5.4..1.5.4
Cisco Umbrella Insights Virtual Appliance eq 1.5.5..1.5.5
Cisco Umbrella Insights Virtual Appliance eq 1.5.6..1.5.6
Cisco Umbrella Insights Virtual Appliance eq 2.0.0..2.0.0
Cisco Umbrella Insights Virtual Appliance eq 2.0.2..2.0.2
Cisco Umbrella Insights Virtual Appliance eq 2.0.3..2.0.3
Cisco Umbrella Insights Virtual Appliance eq 2.1.0..2.1.0
Cisco Umbrella Insights Virtual Appliance eq 2.1.2..2.1.2
Cisco Umbrella Insights Virtual Appliance eq 2.1.5..2.1.5
Cisco Umbrella Insights Virtual Appliance eq 2.1.4..2.1.4
Cisco Umbrella Insights Virtual Appliance eq 2.4.12..2.4.12
Cisco Umbrella Insights Virtual Appliance eq 2.4.6..2.4.6
Cisco Umbrella Insights Virtual Appliance eq 2.4..2.4
Cisco Umbrella Insights Virtual Appliance eq 2.4.4..2.4.4
Cisco Umbrella Insights Virtual Appliance eq 2.5..2.5
Cisco Umbrella Insights Virtual Appliance eq 2.5.4..2.5.4
Cisco Umbrella Insights Virtual Appliance eq 2.5.5..2.5.5
Cisco Umbrella Insights Virtual Appliance eq 2.5.6..2.5.6
Cisco Umbrella Insights Virtual Appliance eq 2.5.7..2.5.7
Cisco Umbrella Insights Virtual Appliance eq 2.6.0..2.6.0
Cisco Umbrella Insights Virtual Appliance eq 2.6.1..2.6.1
Cisco Umbrella Insights Virtual Appliance eq 2.6.2..2.6.2
Cisco Umbrella Insights Virtual Appliance eq 2.7..2.7
Cisco Umbrella Insights Virtual Appliance eq 2.8..2.8
Cisco Umbrella Insights Virtual Appliance eq 2.8.9..2.8.9
Cisco Umbrella Insights Virtual Appliance eq 3.0..3.0
Cisco Umbrella Insights Virtual Appliance eq 3.1..3.1
Cisco Umbrella Insights Virtual Appliance eq 3.2..3.2
Cisco Umbrella Insights Virtual Appliance eq 2.3.1..2.3.1
Cisco Umbrella Insights Virtual Appliance eq 2.3..2.3
Cisco Umbrella Insights Virtual Appliance eq 2.2..2.2
Cisco Umbrella Insights Virtual Appliance eq 2.2.1..2.2.1
Cisco Cyber Vision eq 3.0.4..3.0.4
Cisco Cyber Vision eq 3.0.0..3.0.0
Cisco Cyber Vision eq 3.0.1..3.0.1
Cisco Cyber Vision eq 3.0.2..3.0.2
Cisco Cyber Vision eq 3.0.3..3.0.3
Cisco Cyber Vision eq 3.0.5..3.0.5
Cisco Cyber Vision eq 3.0.6..3.0.6
Cisco Cyber Vision eq 3.1.0..3.1.0
Cisco Cyber Vision eq 3.1.2..3.1.2
Cisco Cyber Vision eq 3.1.1..3.1.1
Cisco Cyber Vision eq 3.2.3..3.2.3
Cisco Cyber Vision eq 3.2.1..3.2.1
Cisco Cyber Vision eq 3.2.4..3.2.4
Cisco Cyber Vision eq 3.2.0..3.2.0
Cisco Cyber Vision eq 3.2.2..3.2.2
Cisco Cyber Vision eq 4.0.0..4.0.0
Cisco Cyber Vision eq 4.0.1..4.0.1
Cisco Cyber Vision eq 4.0.2..4.0.2
Cisco Cyber Vision eq 4.0.3..4.0.3
Cisco Cyber Vision eq 4.1.0..4.1.0
Cisco Cyber Vision eq 4.1.1..4.1.1

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Metrics

6.5

Priority

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

Source: NVD, CVSS v3

5.8

CVSS v3

Severity Medium on the scale from 0 to 10.

Source: CVE.org

0.9 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 58.1

Show all metrics

Severity: Medium
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: 57.72 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: 6.5 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: 5.8
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: 0.9 %; Low — model estimates < 1% 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: 58.1; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
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: 10.11.2022
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-244

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: Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
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

Multiple vulnerabilities in the Server Message Block Version 2 (SMB2) processor of the Snort detection engine on multiple Cisco products could allow an unauthenticated, remote attacker to bypass the configured policies or cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to improper management of system resources when the Snort detection engine is processing SMB2 traffic. An attacker could exploit these vulnerabilities by sending a high rate of certain types of SMB2 packets through an affected device. A successful exploit could allow the attacker to trigger a reload of the Snort process, resulting in a DoS condition. Note: When the snort preserve-connection option is enabled for the Snort detection engine, a successful exploit could also allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network. The snort preserve-connection setting is enabled by default. See the Details ["#details"] section of this advisory for more information. Note: Only products that have Snort 3 configured are affected. Products that are configured with Snort 2 are not affected.

Source: cvelistv5, 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
Cisco	Cisco Cyber Vision	`3.2.3` `3.1.1` `4.1.0` `3.2.2` `4.0.3` `3.1.2` `3.2.0` `3.0.6` `3.0.5` `4.0.1` `3.2.1` `4.1.1` `3.0.2` `3.2.4` `3.0.0` `4.0.2` `3.1.0` `3.0.4` `3.0.3` `3.0.1` `4.0.0`	— — — — — — — — — — — — — — — — — — — — —
Cisco	Cisco Firepower Threat Defense Software	`7.1.0.2` `7.1.0` `7.2.0.1` `7.1.0.1` `7.2.0`	— — — — —
Cisco	Cisco Umbrella Insights Virtual Appliance	`2.5.4` `2.3` `3.0` `2.6.0` `3.1` `2.1.0` `2.4.6` `2.2` `2.7` `2.8` `2.0.2` `2.4.12` `2.5.5` `2.2.1` `3.2` `2.5.6` `2.1.4` `1.5.4` `2.6.1` `2.0.3` `2.4.4` `2.5`	— — — — — — — — — — — — — — — — — — — — — —

Vendors and products

Weakness classes (CWE)

CWE-244Improper Clearing of Heap Memory Before Release ('Heap Inspection')
Variant
Using realloc() to resize buffers that store sensitive information can leave the sensitive information exposed to attack, because it is not removed from memory.
Entry at MITRE CWE-244

References & sources

sec.cloudapps.cisco.comcisco-sa-snort-smb-3nfhJtr

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).

11.08.2026Product identifiers remappedNVD

Product mapping changed:

Cisco Firepower Threat Defense Software (7.1.0)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Product configuration	changed	OR cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:::::::	OR cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0:::::::