---
id: CVE-2015-7575
title: >-
  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, whi…
summary: >-
  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, whi…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-19
vendor: mozilla
product: network_security_services
affected:
  - network_security_services <= 3.20.1
  - leap = 42.1
  - opensuse = 13.1
  - opensuse = 13.2
  - firefox = 38.0
  - firefox = 38.0.1
  - firefox = 38.0.5
  - firefox = 38.1.0
  - firefox = 38.1.1
  - firefox = 38.2.0
  - firefox = 38.2.1
  - firefox = 38.3.0
  - firefox = 38.4.0
  - firefox = 38.5.0
  - firefox = 38.5.1
  - ubuntu_linux = 14.04
  - ubuntu_linux = 15.04
  - ubuntu_linux = 15.10
  - firefox <= 43.0.1
published: '2016-01-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:17:14.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2015-7575'
references:
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00038.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00041.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00042.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00043.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00044.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00045.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00047.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00048.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2015-12/msg00139.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-01/msg00005.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-01/msg00058.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-01/msg00059.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00007.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00101.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00166.html'
    label: secalert@redhat.com
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0049.html'
    label: secalert@redhat.com
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0050.html'
    label: secalert@redhat.com
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0053.html'
    label: secalert@redhat.com
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0054.html'
    label: secalert@redhat.com
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0055.html'
    label: secalert@redhat.com
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0056.html'
    label: secalert@redhat.com
  - url: 'http://www.debian.org/security/2016/dsa-3436'
    label: secalert@redhat.com
  - url: 'http://www.debian.org/security/2016/dsa-3437'
    label: secalert@redhat.com
  - url: 'http://www.debian.org/security/2016/dsa-3457'
    label: secalert@redhat.com
  - url: 'http://www.debian.org/security/2016/dsa-3458'
    label: secalert@redhat.com
  - url: 'http://www.debian.org/security/2016/dsa-3465'
    label: secalert@redhat.com
  - url: 'http://www.debian.org/security/2016/dsa-3491'
    label: secalert@redhat.com
  - url: 'http://www.debian.org/security/2016/dsa-3688'
    label: secalert@redhat.com
  - url: 'http://www.mozilla.org/security/announce/2015/mfsa2015-150.html'
    label: secalert@redhat.com
  - url: >-
      http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
    label: secalert@redhat.com
  - url: >-
      http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    label: secalert@redhat.com
  - url: >-
      http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
    label: secalert@redhat.com
  - url: 'http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html'
    label: secalert@redhat.com
  - url: >-
      http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
    label: secalert@redhat.com
  - url: 'http://www.securityfocus.com/bid/79684'
    label: secalert@redhat.com
  - url: 'http://www.securityfocus.com/bid/91787'
    label: secalert@redhat.com
  - url: 'http://www.securitytracker.com/id/1034541'
    label: secalert@redhat.com
  - url: 'http://www.securitytracker.com/id/1036467'
    label: secalert@redhat.com
  - url: 'http://www.ubuntu.com/usn/USN-2863-1'
    label: secalert@redhat.com
  - url: 'http://www.ubuntu.com/usn/USN-2864-1'
    label: secalert@redhat.com
  - url: 'http://www.ubuntu.com/usn/USN-2865-1'
    label: secalert@redhat.com
  - url: 'http://www.ubuntu.com/usn/USN-2866-1'
    label: secalert@redhat.com
  - url: 'http://www.ubuntu.com/usn/USN-2884-1'
    label: secalert@redhat.com
  - url: 'http://www.ubuntu.com/usn/USN-2904-1'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2016:1430'
    label: secalert@redhat.com
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1158489'
    label: secalert@redhat.com
  - url: >-
      https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.20.2_release_notes
    label: secalert@redhat.com
  - url: 'https://security.gentoo.org/glsa/201701-46'
    label: secalert@redhat.com
  - url: 'https://security.gentoo.org/glsa/201706-18'
    label: secalert@redhat.com
  - url: 'https://security.gentoo.org/glsa/201801-15'
    label: secalert@redhat.com
  - url: 'https://security.netapp.com/advisory/ntap-20160225-0001/'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00038.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00041.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00042.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00043.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00044.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00045.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00047.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00048.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2015-12/msg00139.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-01/msg00005.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-01/msg00058.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-01/msg00059.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00007.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00101.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-updates/2016-02/msg00166.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0049.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0050.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0053.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0054.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0055.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://rhn.redhat.com/errata/RHSA-2016-0056.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.debian.org/security/2016/dsa-3436'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.debian.org/security/2016/dsa-3437'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.debian.org/security/2016/dsa-3457'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.debian.org/security/2016/dsa-3458'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.debian.org/security/2016/dsa-3465'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.debian.org/security/2016/dsa-3491'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.debian.org/security/2016/dsa-3688'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.mozilla.org/security/announce/2015/mfsa2015-150.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.securityfocus.com/bid/79684'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.securityfocus.com/bid/91787'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.securitytracker.com/id/1034541'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.securitytracker.com/id/1036467'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.ubuntu.com/usn/USN-2863-1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.ubuntu.com/usn/USN-2864-1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.ubuntu.com/usn/USN-2865-1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.ubuntu.com/usn/USN-2866-1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.ubuntu.com/usn/USN-2884-1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.ubuntu.com/usn/USN-2904-1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2016:1430'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1158489'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.20.2_release_notes
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/201701-46'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/201706-18'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/201801-15'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20160225-0001/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
epss: 0.02904
epssPercentile: 0.86891
ingestedAt: '2026-10-14T23:00:01.997Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T21:32:54.650467Z'
---

## Overview

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.

## Affected

- `network_security_services <= 3.20.1`
- `leap = 42.1`
- `opensuse = 13.1`
- `opensuse = 13.2`
- `firefox = 38.0`
- `firefox = 38.0.1`
- `firefox = 38.0.5`
- `firefox = 38.1.0`
- `firefox = 38.1.1`
- `firefox = 38.2.0`
- `firefox = 38.2.1`
- `firefox = 38.3.0`
- `firefox = 38.4.0`
- `firefox = 38.5.0`
- `firefox = 38.5.1`
- `ubuntu_linux = 14.04`
- `ubuntu_linux = 15.04`
- `ubuntu_linux = 15.10`
- `firefox <= 43.0.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.