Secure Endpoint and ClamAV
CVE-2026-20338: ClamAV ZIP File Format Processing Memory Corruption Vulnerability
A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 3.1 7.5
EPSS0.47%Chance of exploitation in 30 days
Public exploitNot tracked
FixNot yet
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Cisco Secure Endpoint 7.0 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 6.1 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 7.1 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 6.1 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 7.1 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 6.1 | See the advisory |
| Cisco Secure Endpoint 6.0 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 6.0 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.8 | See the advisory |
| Cisco Secure Endpoint 1.11 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.10 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.8 | See the advisory |
| Cisco Secure Endpoint 1.10 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.14 | See the advisory |
| Cisco Secure Endpoint 1.10 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.6 | See the advisory |
| Cisco Secure Endpoint 1.9 | See the advisory |
| Cisco Secure Endpoint 1.11 | See the advisory |
| Cisco Secure Endpoint 1.7 | See the advisory |
| Cisco Secure Endpoint 1.13 | See the advisory |
| Cisco Secure Endpoint 1.8 | See the advisory |
| Cisco Secure Endpoint 1.13 | See the advisory |
| Cisco Secure Endpoint 1.9 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.13 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 1.14 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.18 | See the advisory |
| Cisco Secure Endpoint 1.18 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.26 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.26 | See the advisory |
| Cisco Secure Endpoint 1.27 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.17 | See the advisory |
| Cisco Secure Endpoint 1.17 | See the advisory |
| Cisco Secure Endpoint 1.17 | See the advisory |
| Cisco Secure Endpoint 1.19 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.23 | See the advisory |
| Cisco Secure Endpoint 1.23 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.25 | See the advisory |
| Cisco Secure Endpoint 1.25 | See the advisory |
| Cisco Secure Endpoint 1.25 | See the advisory |
| Cisco Secure Endpoint 1.27 | See the advisory |
| Cisco Secure Endpoint 1.27 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.0 | See the advisory |
| Cisco Secure Endpoint 8.0 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.
This vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software.
Exploitation
The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerabilities that are described in CVE-2026-20337 and CVE-2026-20338.
The Cisco PSIRT is not aware of proof-of-concept exploit code for any of the other vulnerabilities that are described in this advisory. The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.