Unauthenticated application hang via malformed chat requests
Published Apr 2, 2025 · Updated Apr 2, 2025
Denial of service in Cisco Enterprise Chat and Email before 12.6(1) ES10 allows remote attackers to hang the application via chat requests. Chat messaging entry points process user-supplied request data without sufficient validation; Cisco does not identify the affected function or field. No authentication or user interaction is required, and recovery can require an administrator to restart application services manually.
Summary
What happened
Denial of service in Cisco Enterprise Chat and Email before 12.6(1) ES10 allows remote attackers to hang the application via chat requests. Chat messaging entry points process user-supplied request data without sufficient validation; Cisco does not identify the affected function or field. No authentication or user interaction is required, and recovery can require an administrator to restart application services manually.
The record
- CVE
- CVE-2025-20139
- Published
- Apr 2, 2025
- Updated
- Apr 2, 2025
- Vendor
- ClamAV
- Product
- Cisco Enterprise Chat and Email
- Classifications
- CWE-185, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 2, 2025CVE publishedPublication date reported by the CVE source.
- Apr 2, 2025Record 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=11.5(1)
- Affected versionversion=11.6(1)
- Affected versionversion=11.6(1)_ES10
- Affected versionversion=11.6(1)_ES11
- Affected versionversion=11.6(1)_ES12
- Affected versionversion=11.6(1)_ES12_ET1
- Affected versionversion=11.6(1)_ES2
- Affected versionversion=11.6(1)_ES3
- Affected versionversion=11.6(1)_ES4
- Affected versionversion=11.6(1)_ES5
- Affected versionversion=11.6(1)_ES6
- Affected versionversion=11.6(1)_ES7
- Affected versionversion=11.6(1)_ES8
- Affected versionversion=11.6(1)_ES9
- Affected versionversion=11.6(1)_ES9a
- Affected versionversion=12.0(1)
- Affected versionversion=12.0(1)_ES1
- Affected versionversion=12.0(1)_ES2
- Affected versionversion=12.0(1)_ES3
- Affected versionversion=12.0(1)_ES4
- Affected versionversion=12.0(1)_ES5
- Affected versionversion=12.0(1)_ES5a
- Affected versionversion=12.0(1)_ES6
- Affected versionversion=12.0(1)_ES6_ET1
- Affected versionversion=12.0(1)_ES6_ET2
- Affected versionversion=12.0(1)_ES6_ET3
- Affected versionversion=12.0(1)_ES7
- Affected versionversion=12.0(1)_ES7_ET1
- Affected versionversion=12.5(1)
- Affected versionversion=12.5(1)_ES1
- Affected versionversion=12.5(1)_ES2
- Affected versionversion=12.5(1)_ES3
- Affected versionversion=12.5(1)_ES3_ET1
- Affected versionversion=12.5(1)_ES3_ET2
- Affected versionversion=12.5(1)_ES3_ET3
- Affected versionversion=12.5(1)_ES4
- Affected versionversion=12.5(1)_ES4_ET1
- Affected versionversion=12.5(1)_ES4_ET2
- Affected versionversion=12.5(1)_ES5
- Affected versionversion=12.5(1)_ES5_ET1
- Affected versionversion=12.5(1)_ES5_ET2
- Affected versionversion=12.5(1)_ES6
- Affected versionversion=12.5(1)_ES6_ET1
- Affected versionversion=12.5(1)_ES7
- Affected versionversion=12.5(1)_ES7_ET1
- Affected versionversion=12.5(1)_ES8
- Affected versionversion=12.5(1)_ES8_ET1
- Affected versionversion=12.5(1)_ES9
- Affected versionversion=12.5(1)_ET1
- Affected versionversion=12.6(1)
- Affected versionversion=12.6(1)_ES1
- Affected versionversion=12.6(1)_ES1_ET1
- Affected versionversion=12.6(1)_ES1_ET2
- Affected versionversion=12.6(1)_ES2
- Affected versionversion=12.6(1)_ES2_ET5
- Affected versionversion=12.6(1)_ES3
- Affected versionversion=12.6(1)_ES3_ET3
- Affected versionversion=12.6(1)_ES4
- Affected versionversion=12.6(1)_ES4_ET1
- Affected versionversion=12.6(1)_ES4_ET2
- Affected versionversion=12.6(1)_ES5
- Affected versionversion=12.6(1)_ES5_ET1
- Affected versionversion=12.6(1)_ES5_ET2
- Affected versionversion=12.6(1)_ES5_ET3
- Affected versionversion=12.6(1)_ES6
- Affected versionversion=12.6(1)_ES6_ET1
- Affected versionversion=12.6(1)_ES6_ET2
- Affected versionversion=12.6(1)_ES6_ET3
- Affected versionversion=12.6(1)_ES7
- Affected versionversion=12.6(1)_ES7_ET1
- Affected versionversion=12.6(1)_ES8
- Affected versionversion=12.6(1)_ES8_ET1
- Affected versionversion=12.6(1)_ES8_ET2
- Affected versionversion=12.6(1)_ES9
- Affected versionversion=12.6(1)_ES9_ET1
- Affected versionversion=12.6(1)_ES9_ET2
- Affected versionversion=12.6(1)_ES9_ET3
- Affected versionversion=12.6(1)_ET1
- Affected versionversion=12.6(1)_ET2
- Affected versionversion=12.6(1)_ET3
- Affected versionversion=12.6_ES2_ET1
- Affected versionversion=12.6_ES2_ET2
- Affected versionversion=12.6_ES2_ET3
- Affected versionversion=12.6_ES2_ET4
- Affected versionversion=12.6_ES3_ET1
- Affected versionversion=12.6_ES3_ET2
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
See the directory against your own environment.
Your stack
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