Unauthenticated root command execution via crafted HTTP requests
Published Dec 17, 2025 · Updated Dec 17, 2025
Improper input validation in Cisco Secure Email products allows remote attackers to execute arbitrary commands as root through crafted HTTP requests. The AsyncOS Spam Quarantine feature insufficiently validates HTTP requests before passing attacker-controlled input into system-command execution. Exposure requires a vulnerable physical or virtual appliance with the nondefault Spam Quarantine feature enabled and internet-reachable; exploitation grants full operating-system control and supports persistent remote access.
Summary
What happened
Improper input validation in Cisco Secure Email products allows remote attackers to execute arbitrary commands as root through crafted HTTP requests. The AsyncOS Spam Quarantine feature insufficiently validates HTTP requests before passing attacker-controlled input into system-command execution. Exposure requires a vulnerable physical or virtual appliance with the nondefault Spam Quarantine feature enabled and internet-reachable; exploitation grants full operating-system control and supports persistent remote access.
The record
- CVE
- CVE-2025-20393
- Published
- Dec 17, 2025
- Updated
- Dec 17, 2025
- Vendor
- ClamAV
- Product
- Cisco Secure Email
- Classifications
- CWE-20, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 17, 2025CVE publishedPublication date reported by the CVE source.
- Dec 17, 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=13.0.0-392
- Affected versionversion=13.0.5-007
- Affected versionversion=13.5.1-277
- Affected versionversion=13.5.4-038
- Affected versionversion=14.0.0-698
- Affected versionversion=14.2.0-620
- Affected versionversion=14.2.1-020
- Affected versionversion=14.3.0-032
- Affected versionversion=15.0.0-104
- Affected versionversion=15.0.1-030
- Affected versionversion=15.0.3-002
- Affected versionversion=15.5.0-048
- Affected versionversion=15.5.1-055
- Affected versionversion=15.5.2-018
- Affected versionversion=15.5.3-022
- Affected versionversion=16.0.0-050
- Affected versionversion=16.0.0-054
- Affected versionversion=16.0.1-017
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.
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
- UAT-9686 active exploitation campaignthreat actor
Technologies
Your stack
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Your stack
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