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CVE-2022-20770

ClamAV CHM File Parsing Denial of Service Vulnerability Affecting Cisco Products: April 2022

HIGH
7.5
CVSS Score
Published: May 4, 2022 at 05:05 PM UTC
Updated: June 17, 2026 at 04:25 AM UTC
5 products affected across 4 vendorsDebian LinuxFedoraClamAV

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Severity
HIGH7.5
Exploit prediction
EPSS 7%
SSVC
No known exploit

Description

On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed: A vulnerability in CHM file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog. This advisory will be updated as additional information becomes available.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Secure Endpoint· Cisco
95%
v < 1.16.3v < 1.17.2v < 7.5.51.18.0 ≤ v < 1.18.2
Affected range stops below 1.16.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.17.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.18.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.5.5, so it looks safe — our inference, not a vendor statement
ClamAV· Clamav
95%
v ≤ 0.103.50.104.0 ≤ v ≤ 0.104.2
Debian Linux· Debiandrupal
95%
9.0
Fedora· Fedora Projectrpm
95%
343536
Advanced Malware Protection for Endpoints· Cisco
60%
All versions

References (6)

Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/06/msg00004.html
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7RV6BLIATIJE74SQ6NG5ZC4JK5MMDQ2R/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BX5ZXNHP4NFYQ5BFSKY3WT7NTBZUYG7L/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N4NNBIJVG6Z4PDIKUZXTYXICYUAYAZ56/
Vendor Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202310-01
Vendor AdvisoryThird Party Advisory
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-dos-prVGcHLd

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-399NVD-CWE-noinfo

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