Antivirus bypass via crafted Range header
Published Feb 5, 2025 · Updated Feb 5, 2025
Improper input validation in Cisco Secure Web Appliance AsyncOS allows remote attackers to bypass antivirus scanning with crafted HTTP requests. The policy-based AVC implementation mishandles a crafted Range header while forwarding an HTTP request through the appliance. Exploitation requires the Range Request Forward feature, which is disabled by default, and permits malware to reach an endpoint without detection.
Summary
What happened
Improper input validation in Cisco Secure Web Appliance AsyncOS allows remote attackers to bypass antivirus scanning with crafted HTTP requests. The policy-based AVC implementation mishandles a crafted Range header while forwarding an HTTP request through the appliance. Exploitation requires the Range Request Forward feature, which is disabled by default, and permits malware to reach an endpoint without detection.
The record
- CVE
- CVE-2025-20183
- Published
- Feb 5, 2025
- Updated
- Feb 5, 2025
- Vendor
- ClamAV
- Product
- Cisco Secure Web Appliance
- Classifications
- CWE-20, T1562.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 5, 2025CVE publishedPublication date reported by the CVE source.
- Feb 5, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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=15.1.0-287
- Affected versionversion=15.2.0-116
- Affected versionversion=15.2.0-164
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
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Technologies
Your stack
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Your stack
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