Vulnerability threat dossier
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.
VTP analyst assessment
The latest persisted AI review did not propose this CVE for analyst escalation. Deterministic monitoring remains authoritative for the factual states below.
Unknown from persisted AI analysis.
No AI candidate evidence set is persisted for this CVE.
No first-party sensor telemetry is configured. Local exploitation observation is unknown.
Independent primary confirmation of active exploitation would materially change this assessment.
VTP deterministic assessment
A proof of concept is reported; functional reliability is not established.
EPSS is 0.00; this is predictive context, not exploitation evidence.
No first-party sensor telemetry is configured; first-party observation is unknown.
Material change ledger
Claim provenance
2 primary sources · 0 dependent secondary reports · 2 reports with unresolved independence. Repetition remains visible without multiplying confirmation.
Event history
BleepingComputer supplied a deterministically extracted signal; review the linked evidence before escalation.
Cisco Product Security Incident Response Team published evidence linked to CVE-2026-20337.
CERT-FR published evidence linked to CVE-2026-20337.
Original publications
Cisco warned of two high-severity vulnerabilities affecting the Secure Endpoint Connector that allow threat actors to crash the ClamAV scanning process in denial-of-service (DoS) attacks. [...]
Multiple vulnerabilities in ClamAV could allow a remote attacker to cause a denial of service (DoS) condition, interrupting scanning operations. For more information about these vulnerabilities, see the Details section of this advisory. For additional information on these vulnerabilities in ClamAV, see the ClamAV blog . Cisco plans to release software updates that address these vulnerabilities in affected Cisco platforms. There are no workarounds that address these vulnerabilities. Notes: The Security Impact Rating (SIR) for these vulnerabilities is High for Windows-based platforms only because those platforms run the ClamAV scanning process in a privileged security context. The platforms that are highly impacted include Cisco Secure Endpoint Connector for Windows. The SIR for these vulnerabilities is Medium on other platforms, including Linux and Mac platforms, because those platforms run the ClamAV scanning process in a lower-privileged security context. The affected platforms include Secure Endpoint Connector for Linux and Mac. Cisco Secure Endpoint Private Cloud itself is not impacted by these vulnerabilities. However, the Cisco Secure Endpoint Connector software that is distributed from the device is impacted. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26 <br/>Security Impact Rating: High <br/>CVE: CVE-2026-20337,CVE-2026-20338,CVE-2026-20339,CVE-2026-20345,CVE-2026-20346,CVE-2026-20347,CVE-2026-20348
Remote, unauthenticated attackers could exploit the bugs to cause a denial-of-service (DoS) condition. The post Cisco Warns of High-Severity ClamAV Vulnerabilities With Public PoC appeared first on SecurityWeek .
De multiples vulnérabilités ont été découvertes dans ClamAV. Certaines d'entre elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données, un déni de service et un problème de sécurité non spécifié par l'éditeur.
Technical vulnerability data
Raw observations
No first-party sensor telemetry configured.