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Fencer Vulns
high 8.6

CVE-2022-20770 json

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

published 2022-05-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-26020

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
7.1%
EPSS 7.1% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • cisco secure_endpoint 1.16.3, 1.17.2, 1.18.2, 7.5.5
  • clamav Debian 14, Debian 13, Debian 12 0.103.6+dfsg-1

debian advisories DEBIAN-CVE-2022-20770

  • clamav Ubuntu 18.04 LTS 0.103.6+dfsg-0ubuntu0.18.04.1
  • clamav Ubuntu 20.04 LTS 0.103.6+dfsg-0ubuntu0.20.04.1
  • clamav Ubuntu 22.04 LTS 0.103.6+dfsg-0ubuntu0.22.04.1
  • clamav Ubuntu Pro 14.04 LTS 0.103.6+dfsg-0ubuntu0.14.04.1+esm1
  • clamav Ubuntu Pro 16.04 LTS 0.103.6+dfsg-0ubuntu0.16.04.1+esm1

ubuntu advisories UBUNTU-CVE-2022-20770

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • clamav SLES for SAP 12 SP5, SLES 12 SP5 0.103.6-3.18.1
  • clamav SLE Module for Basesystem 15 SP4, SLE Module for Basesystem 15 SP3, openSUSE Leap 15.4 +1 more 0.103.6-150000.3.38.1

suse advisories SUSE-SU-2022:1647-1SUSE-SU-2022:1644-1

  • clamav openSUSE Tumbleweed 0.103.6-1.1

opensuse advisories openSUSE-SU-2024:12047-1

  • clamav Alpine 3.13, Alpine 3.12 0.103.6-r0

alpine advisories ALPINE-CVE-2022-20770

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • clamav CBL-Mariner 2.0 0.105.0-1

azure linux advisories AZL-9666

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • clamav Arch Linux 0.105.0-1

arch linux advisories AVG-2722

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-20770 updated cvss 8.6

clamav: Unauthenticated, remote attacker to cause a denial of service during CHM file parse

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

7.07% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • Cisco Cisco AMP for Endpoints

Classification

Weakness
  • CWE-399 Resource Management Errors

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.