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TI-2015-02398 Aliases CVE-2015-2721GHSA-fhwj-6xh8-h4rw

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before…

Priority LOW 25CWE-310Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Medium
Impact type
—
Confidentiality · integrity · availability
None · Partial · None
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.

Summary

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

Why it matters now

EPSS 0.02825 86th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 2 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 30

CPEVersionsRoleVendor
cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:12.0:*:*:*:*:*:*:*12.0VulnerableNovell
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*12.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*14.10VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*15.04VulnerableCanonical
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*7.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:novell:suse_linux_enterprise_desktop:12.0:*:*:*:*:*:*:*12.0VulnerableNovell
cpe:2.3:o:novell:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:*11 sp4VulnerableNovell
cpe:2.3:o:novell:suse_linux_enterprise_server:12.0:*:*:*:*:*:*:*12.0VulnerableNovell
  • cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·Novell
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:* Versions 12.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:* Versions 14.10 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:* Versions 15.04 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:novell:suse_linux_enterprise_desktop:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·Novell
  • cpe:2.3:o:novell:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:* Versions 11 sp4 Vulnerable ·Novell
  • cpe:2.3:o:novell:suse_linux_enterprise_server:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·Novell
Show 20 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:mozilla:network_security_services:3.19:*:*:*:*:*:*:*3.19VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*up to 38.1.0Running onMozilla
cpe:2.3:a:mozilla:firefox:31.0:*:*:*:*:*:*:*31.0Running onMozilla
cpe:2.3:a:mozilla:firefox:31.1.0:*:*:*:*:*:*:*31.1.0Running onMozilla
cpe:2.3:a:mozilla:firefox:31.1.1:*:*:*:*:*:*:*31.1.1Running onMozilla
cpe:2.3:a:mozilla:firefox:31.3.0:*:*:*:*:*:*:*31.3.0Running onMozilla
cpe:2.3:a:mozilla:firefox:31.5.1:*:*:*:*:*:*:*31.5.1Running onMozilla
cpe:2.3:a:mozilla:firefox:31.5.2:*:*:*:*:*:*:*31.5.2Running onMozilla
cpe:2.3:a:mozilla:firefox:31.5.3:*:*:*:*:*:*:*31.5.3Running onMozilla
cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*38.0Running onMozilla
cpe:2.3:a:mozilla:firefox_esr:31.1:*:*:*:*:*:*:*31.1Running onMozilla
cpe:2.3:a:mozilla:firefox_esr:31.2:*:*:*:*:*:*:*31.2Running onMozilla
cpe:2.3:a:mozilla:firefox_esr:31.3:*:*:*:*:*:*:*31.3Running onMozilla
cpe:2.3:a:mozilla:firefox_esr:31.4:*:*:*:*:*:*:*31.4Running onMozilla
cpe:2.3:a:mozilla:firefox_esr:31.5:*:*:*:*:*:*:*31.5Running onMozilla
cpe:2.3:a:mozilla:firefox_esr:31.6.0:*:*:*:*:*:*:*31.6.0Running onMozilla
cpe:2.3:a:mozilla:firefox_esr:31.7.0:*:*:*:*:*:*:*31.7.0Running onMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*up to 38.0.1Running onMozilla
cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*11.3VulnerableOracle
cpe:2.3:o:oracle:vm_server:3.2:*:*:*:*:*:*:*3.2VulnerableOracle
  • cpe:2.3:a:mozilla:network_security_services:3.19:*:*:*:*:*:*:* Versions 3.19 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions up to 38.1.0 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:31.0:*:*:*:*:*:*:* Versions 31.0 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:31.1.0:*:*:*:*:*:*:* Versions 31.1.0 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:31.1.1:*:*:*:*:*:*:* Versions 31.1.1 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:31.3.0:*:*:*:*:*:*:* Versions 31.3.0 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:31.5.1:*:*:*:*:*:*:* Versions 31.5.1 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:31.5.2:*:*:*:*:*:*:* Versions 31.5.2 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:31.5.3:*:*:*:*:*:*:* Versions 31.5.3 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:* Versions 38.0 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:31.1:*:*:*:*:*:*:* Versions 31.1 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:31.2:*:*:*:*:*:*:* Versions 31.2 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:31.3:*:*:*:*:*:*:* Versions 31.3 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:31.4:*:*:*:*:*:*:* Versions 31.4 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:31.5:*:*:*:*:*:*:* Versions 31.5 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:31.6.0:*:*:*:*:*:*:* Versions 31.6.0 Running on ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:31.7.0:*:*:*:*:*:*:* Versions 31.7.0 Running on ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions up to 38.0.1 Running on ·Mozilla
  • cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:* Versions 11.3 Vulnerable ·Oracle
  • cpe:2.3:o:oracle:vm_server:3.2:*:*:*:*:*:*:* Versions 3.2 Vulnerable ·Oracle

Remediation

Red Hat 2 advisories

  • RHSA-2015:1664 Released 2015-08-24 · Red Hat rating Moderate
    nss security, bug fix, and enhancement update
    • Red Hat Enterprise Linux (v. 5 server) nss-3.19.1-1.el5_11, nss-3.19.1-1.el5_11.i386, nss-3.19.1-1.el5_11.ia64 +13
    • Red Hat Enterprise Linux Desktop (v. 5 client) nss-3.19.1-1.el5_11, nss-3.19.1-1.el5_11.i386, nss-tools-3.19.1-1.el5_11 +1
    • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nss-3.19.1-1.el5_11, nss-devel-3.19.1-1.el5_11, nss-devel-3.19.1-1.el5_11.i386 +2
  • RHSA-2015:1185 Released 2015-06-25 · Red Hat rating Moderate
    nss security update
    • Red Hat Enterprise Linux Client (v. 7) nss-3.19.1-3.el7_1, nss-sysinit-3.19.1-3.el7_1, nss-tools-3.19.1-3.el7_1 +1
    • Red Hat Enterprise Linux Client Optional (v. 7) nss-devel-3.19.1-3.el7_1, nss-pkcs11-devel-3.19.1-3.el7_1, nss-util-devel-3.19.1-1.el7_1
    • Red Hat Enterprise Linux ComputeNode (v. 7) nss-3.19.1-3.el7_1, nss-sysinit-3.19.1-3.el7_1, nss-tools-3.19.1-3.el7_1 +1
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) nss-devel-3.19.1-3.el7_1, nss-pkcs11-devel-3.19.1-3.el7_1, nss-util-devel-3.19.1-1.el7_1
    • Red Hat Enterprise Linux Desktop (v. 6) nss-3.19.1-3.el6_6, nss-sysinit-3.19.1-3.el6_6, nss-tools-3.19.1-3.el6_6 +1
    • Red Hat Enterprise Linux Desktop Optional (v. 6) nss-devel-3.19.1-3.el6_6, nss-pkcs11-devel-3.19.1-3.el6_6, nss-util-devel-3.19.1-1.el6_6
    • Red Hat Enterprise Linux HPC Node (v. 6) nss-3.19.1-3.el6_6, nss-sysinit-3.19.1-3.el6_6, nss-tools-3.19.1-3.el6_6 +1
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) nss-devel-3.19.1-3.el6_6, nss-pkcs11-devel-3.19.1-3.el6_6, nss-util-devel-3.19.1-1.el6_6
    • Red Hat Enterprise Linux Server (v. 6) nss-3.19.1-3.el6_6, nss-3.19.1-3.el6_6.ppc, nss-devel-3.19.1-3.el6_6 +7
    • Red Hat Enterprise Linux Server (v. 7) nss-3.19.1-3.ael7b_1, nss-3.19.1-3.el7_1, nss-3.19.1-3.el7_1.ppc +13
    • Red Hat Enterprise Linux Server Optional (v. 6) nss-pkcs11-devel-3.19.1-3.el6_6, nss-pkcs11-devel-3.19.1-3.el6_6.ppc
    • Red Hat Enterprise Linux Server Optional (v. 7) nss-pkcs11-devel-3.19.1-3.ael7b_1, nss-pkcs11-devel-3.19.1-3.el7_1, nss-pkcs11-devel-3.19.1-3.el7_1.ppc
    • Red Hat Enterprise Linux Workstation (v. 6) nss-3.19.1-3.el6_6, nss-devel-3.19.1-3.el6_6, nss-sysinit-3.19.1-3.el6_6 +3
    • Red Hat Enterprise Linux Workstation (v. 7) nss-3.19.1-3.el7_1, nss-devel-3.19.1-3.el7_1, nss-sysinit-3.19.1-3.el7_1 +3
    • Red Hat Enterprise Linux Workstation Optional (v. 6) nss-pkcs11-devel-3.19.1-3.el6_6
    • Red Hat Enterprise Linux Workstation Optional (v. 7) nss-pkcs11-devel-3.19.1-3.el7_1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2015:1664
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2015:1185
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2015:1185
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2015:1664
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Desktop Workstation (v. 5 client)Fixed RHSA-2015:1664
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2015:1185
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2015:1185
Not affected: 3 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2015-2721
  2. 2026-10-03 Alias added: GHSA-fhwj-6xh8-h4rw

References

Exploit 1

Advisory 21

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences