Remote command execution via malformed HTTP requests
Published Jan 21, 2026 · Updated Jan 21, 2026
Code injection in Cisco Unified Communications products allows remote attackers to execute commands through the web management interface. The interface improperly validates user-supplied input across a sequence of crafted HTTP requests before operating-system command execution. No authentication or nondefault configuration is required; successful exploitation yields user-level operating-system access followed by root privilege escalation.
Summary
What happened
Code injection in Cisco Unified Communications products allows remote attackers to execute commands through the web management interface. The interface improperly validates user-supplied input across a sequence of crafted HTTP requests before operating-system command execution. No authentication or nondefault configuration is required; successful exploitation yields user-level operating-system access followed by root privilege escalation.
The record
- CVE
- CVE-2026-20045
- Published
- Jan 21, 2026
- Updated
- Jan 21, 2026
- Vendor
- ClamAV
- Product
- Cisco Unified Communications Manager IM and Presence Service
- Classifications
- CWE-94, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 21, 2026Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
- Jan 21, 2026CVE publishedPublication date reported by the CVE source.
- Jan 21, 2026Record 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=12.5(1)
- Affected versionversion=12.5(1)SU1
- Affected versionversion=12.5(1)SU2
- Affected versionversion=12.5(1)SU3
- Affected versionversion=12.5(1)SU4
- Affected versionversion=12.5(1)SU5
- Affected versionversion=12.5(1)SU6
- Affected versionversion=12.5(1)SU7
- Affected versionversion=12.5(1)SU8
- Affected versionversion=12.5(1)SU9
- Affected versionversion=14
- Affected versionversion=14SU1
- Affected versionversion=14SU2
- Affected versionversion=14SU2a
- Affected versionversion=14SU3
- Affected versionversion=14SU4
- Affected versionversion=15
- Affected versionversion=15SU1
- Affected versionversion=15SU2
- Affected versionversion=15SU3
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.
Reported exploitation
- Cisco PSIRT attempted exploitation reportreported exploitation
- CISA Known Exploited Vulnerabilities catalog entryknown exploited catalog
Technologies
Your stack
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Your stack
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