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CVE-2026-20216

34
FAUCET Score

A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper handling of temporary resources during file scanning. An attacker could exploit this vulnerability by submitting a crafted InstallShield file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process and temporarily consume available system resources, resulting in a DoS condition on the affected software.

First published: Jul 1, 2026Last modified: Jul 1, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.27.2CPE matchmatch criteria
cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:*
< 1.29.0CPE matchmatch criteria
cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:*
< 8.6.2CPE matchmatch criteria
cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*
< 1.4.5CPE matchmatch criteria
cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*
>= 1.5.0, < 1.5.3CPE matchmatch criteria
cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.50%
Probability of exploitation in next 30 days
EPSS Percentile
39.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 18th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: azl3 clamav 1.5.2-3 on Azure Linux 3.0Fixed in: 1.5.3-1
microsoftpatch availablevia msrc
Product: 21568-17084Fixed in: 1.5.3-1
ubuntupatch availablevia ubuntu_usn
Product: clamav (jammy)Fixed in: 1.5.3+dfsg-0ubuntu0.22.04.2
ubuntupatch availablevia ubuntu_usn
Product: clamav (noble)Fixed in: 1.5.3+dfsg-0ubuntu0.24.04.1
ubuntupatch availablevia ubuntu_usn
Product: clamav (resolute)Fixed in: 1.5.3+dfsg-0ubuntu0.26.04.1
ciscovendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

ubuntuUSN-8517-1

ClamAV vulnerabilities

Jul 8, 2026
microsoft2026-Jul/CVE-2026-20216Important

ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability

Jul 2, 2026

References

sec.cloudapps.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR
Vendor Advisory