How to check if you are exposed to CVE-2016-9079
- Find every Mozilla Firefox, Firefox ESR, and Thunderbird system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
- Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
- Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2016-9079.
US federal agencies had to fix this by 2023-07-13. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.
Timeline
- · Added to CISA's Known Exploited Vulnerabilities catalog
- · Fix-by date for US federal agencies, passed 1,207 days ago
Vendor advisories and fixes
Weakness type
More exploited Mozilla vulnerabilities
CISA lists 13 exploited Mozilla vulnerabilities. The closest matches:
- CVE-2010-3765Mozilla Multiple Products Remote Code Execution VulnerabilityAdded 2025-10-06
- CVE-2024-9680Mozilla Firefox Use-After-Free VulnerabilityAdded 2024-10-15
- CVE-2015-4495Mozilla Firefox Security Feature Bypass VulnerabilityAdded 2022-05-25
- CVE-2019-11708Mozilla Firefox and Thunderbird Sandbox Escape VulnerabilityAdded 2022-05-23
- CVE-2019-11707Mozilla Firefox and Thunderbird Type Confusion VulnerabilityAdded 2022-05-23
- CVE-2013-1690Mozilla Firefox and Thunderbird Denial-of-Service VulnerabilityAdded 2022-03-28
- CVE-2022-26486Mozilla Firefox Use-After-Free VulnerabilityAdded 2022-03-07
- CVE-2022-26485Mozilla Firefox Use-After-Free VulnerabilityAdded 2022-03-07
Keep going
Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.