Unauthenticated malware delivery via crafted archive handling
Published Feb 4, 2026 · Updated Feb 4, 2026
Archive scanning bypass in Cisco Secure Web Appliance allows remote attackers to deliver malicious archive files through affected devices. The Dynamic Vectoring and Streaming Engine improperly handles crafted archives and permits files that the anti-malware scanner should block. No authentication or special configuration is required, but infection requires an end user to extract and launch the downloaded file.
Summary
What happened
Archive scanning bypass in Cisco Secure Web Appliance allows remote attackers to deliver malicious archive files through affected devices. The Dynamic Vectoring and Streaming Engine improperly handles crafted archives and permits files that the anti-malware scanner should block. No authentication or special configuration is required, but infection requires an end user to extract and launch the downloaded file.
The record
- CVE
- CVE-2026-20056
- Published
- Feb 4, 2026
- Updated
- Feb 4, 2026
- Vendor
- ClamAV
- Product
- Cisco Secure Web Appliance
- Classifications
- CWE-494, T1027
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 4, 2026CVE publishedPublication date reported by the CVE source.
- Feb 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=11.8.0-414
- Affected versionversion=11.8.0-429
- Affected versionversion=11.8.0-453
- Affected versionversion=11.8.1-023
- Affected versionversion=11.8.3-018
- Affected versionversion=11.8.3-021
- Affected versionversion=11.8.4-004
- Affected versionversion=12.0.1-268
- Affected versionversion=12.0.1-334
- Affected versionversion=12.0.2-004
- Affected versionversion=12.0.2-012
- Affected versionversion=12.0.3-005
- Affected versionversion=12.0.3-007
- Affected versionversion=12.0.4-002
- Affected versionversion=12.0.5-011
- Affected versionversion=12.5.1-011
- Affected versionversion=12.5.1-043
- Affected versionversion=12.5.2-007
- Affected versionversion=12.5.2-011
- Affected versionversion=12.5.3-002
- Affected versionversion=12.5.4-005
- Affected versionversion=12.5.4-011
- Affected versionversion=12.5.5-004
- Affected versionversion=12.5.5-005
- Affected versionversion=12.5.5-008
- Affected versionversion=12.5.6-008
- Affected versionversion=14.0.1-014
- Affected versionversion=14.0.1-040
- Affected versionversion=14.0.1-053
- Affected versionversion=14.0.1-503
- Affected versionversion=14.0.2-012
- Affected versionversion=14.0.3-014
- Affected versionversion=14.0.4-005
- Affected versionversion=14.0.5-007
- Affected versionversion=14.1.0-032
- Affected versionversion=14.1.0-041
- Affected versionversion=14.1.0-047
- Affected versionversion=14.5.0-498
- Affected versionversion=14.5.0-537
- Affected versionversion=14.5.0-673
- Affected versionversion=14.5.1-008
- Affected versionversion=14.5.1-016
- Affected versionversion=14.5.1-510
- Affected versionversion=14.5.1-607
- Affected versionversion=14.5.2-011
- Affected versionversion=14.5.3-033
- Affected versionversion=15.0.0-322
- Affected versionversion=15.0.0-355
- Affected versionversion=15.0.1-004
- Affected versionversion=15.1.0-287
- Affected versionversion=15.2.0-116
- Affected versionversion=15.2.0-164
- Affected versionversion=15.2.1-011
- Affected versionversion=15.2.2-009
- Affected versionversion=15.2.3-007
- Affected versionversion=15.2.4-022
- Affected versionversion=15.5.0-566
- Affected versionversion=15.5.0-574
- Affected versionversion=15.5.0-710
- Affected versionversion=15.5.1-002
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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