CVE-2026-20337: ClamAV ZIP File Format Processing Memory Corruption Vulnerability
Cisco · Cisco Secure Endpoint
No fix listed · Affected: Cisco Secure Endpoint · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
Higher than 49% of scored CVEs
DescriptionNVD
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 boundary checks for content in zip files during scanning, which may result in an out-of-bounds write condition. 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, resulting in a DoS condition on the affected software.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Cisco
- Published
- August 2026
Coverage2 articles · 2 outlets
One row per outlet, in order of first report. First in our coverage: SecurityWeek, 10 Aug.
- Mon 10 Aug, 14:41 UTC. SecurityWeek, first report. Cisco flags ClamAV bugs in Secure Endpoint Connector, risking DoS.
- Tue 11 Aug, 16:32 UTC. Security Affairs, its first report on the story. Cisco Warns of Critical ClamAV Flaws Affecting Secure Endpoint.
- First report
- Article
- Running total
Show as tableHide table
| Published (UTC) | Outlet | Headline |
|---|---|---|
| 10 Aug 14:41 | SecurityWeek | Cisco flags ClamAV bugs in Secure Endpoint Connector, risking DoS |
| 11 Aug 16:32 | Security Affairs | Cisco Warns of Critical ClamAV Flaws Affecting Secure Endpoint |
- Cisco Warns of Critical ClamAV Flaws Affecting Secure EndpointSecurity Affairs
- Cisco flags ClamAV bugs in Secure Endpoint Connector, risking DoSSecurityWeek · first in our coverage
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