Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

• cpe debian/debian linux9.0
• cpe mozilla/firefoxversion unspecified
• cpe mozilla/thunderbirdversion unspecified
• cpe redhat/enterprise linux5.0
• cpe redhat/enterprise linux6.0
• cpe redhat/enterprise linux7.0
• cpe redhat/enterprise linux desktop5.0
• cpe redhat/enterprise linux desktop6.0
• cpe redhat/enterprise linux desktop7.0
• cpe redhat/enterprise linux server5.0
• cpe torproject/torversion unspecified
• vendor Mozilla Firefox and Thunderbirdversion unspecified
• vendor Mozilla Firefox, Firefox ESR, and Thunderbirdversion unspecified

How to fix CVE-2016-9079

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Jul 13, 2023.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Technology hubs

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Jun 11, 2018 · Catalog

   Detected

   A use-after-free vulnerability in SVG Animation has been discovered. An exploit built on this vulnerability has been discovered in the wild targeting Firefox and Tor Browser users on Windows. This vulnerability affects Firefox < 50.0.2, Firefox ESR < 45.5.1, and Thunderbird < 45.5.1.

2. Jun 22, 2023 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Jul 13, 2023 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   A use-after-free vulnerability in SVG Animation has been discovered. An exploit built on this vulnerability has been discovered in the wild targeting Firefox and Tor Browser users on Windows. This vulnerability affects Firefox < 50.0.2, Firefox ESR < 45.5.1, and Thunderbird < 45.5.1.

Sources

• CISA KEVConfirmed exploitationCVE-2016-9079

  Mozilla Firefox, Firefox ESR, and Thunderbird contain a use-after-free vulnerability in SVG Animation, targeting Firefox and Tor browser users on Windows.

  cisa.gov
• CVE.orgVulnerability recordCVE-2016-9079

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2016-9079

  30-day exploitation probability 87.5%

  first.org
• Exploit DatabasePublic exploit reference41151

  Public archive entry. The exploit body is not stored here.

  exploit-db.com
• Exploit DatabasePublic exploit reference42327

  Public archive entry. The exploit body is not stored here.

  exploit-db.com
• Metasploit ModulesPublic exploit moduleexploit_windows/browser/firefox_smil_uaf

  Public module reference (normal). Module source is not copied into this catalog.

  rapid7.com
• NIST NVDVulnerability recordCVE-2016-9079

  A use-after-free vulnerability in SVG Animation has been discovered. An exploit built on this vulnerability has been discovered in the wild targeting Firefox and Tor Browser users on Windows. This vulnerability affects Firefox < 50.0.2, Firefox ESR < 45.5.1, and Thunderbird < 45.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2016-9079

  Mozilla Firefox, Firefox ESR, and Thunderbird contain a use-after-free vulnerability in SVG Animation, targeting Firefox and Tor browser users on Windows.

  vulncheck.com

References

• Third Party Advisory · rhn.redhat.com
• Third Party Advisory · rhn.redhat.com
• Broken Link · securityfocus.com
• Third Party Advisory · securitytracker.com
• Exploit · bugzilla.mozilla.org
• VulnCheck exploitation evidence · docs.google.com
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · forbes.com
• CISA note · mozilla.org
• Vendor Advisory · mozilla.org

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.