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Exploited vulnerability · CISA KEV

Is CVE-2016-9079 exploited? Yes: in CISA KEV since 22 Jun 2023

Gociux · Mozilla Firefox, Firefox ESR, and Thunderbird · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2016-9079, Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 22 Jun 2023, 1837 days after it was published. It affects Mozilla Firefox, Firefox ESR, and Thunderbird. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 22 Jun 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.5CVSS 3.1 · high
US federal due13 Jul 2023BOD 22-01 deadline

What it is

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

VendorMozilla (13 exploited CVEs in KEV)
ProductFirefox, Firefox ESR, and Thunderbird
VulnerabilityMozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
WeaknessCWE-416
Published11 Jun 2018
Added to KEV22 Jun 2023
Reported by (CNA)mozilla

What to do

  1. Check whether you run it. Look for Firefox, Firefox ESR, and Thunderbird in your asset inventory, including appliances and cloud images. Stack check lists every exploited Mozilla CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 11 Jun 2018.
  4. Get told next time. Email alerts when CISA adds a CVE for Mozilla.

References

Questions

Is CVE-2016-9079 being exploited?

Yes. CISA added CVE-2016-9079 to the Known Exploited Vulnerabilities catalog on 22 Jun 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2016-9079 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2016-9079?

Apply updates per vendor instructions. Check Mozilla's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Firefox, Firefox ESR, and Thunderbird and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2023 · Mozilla scorecard · act-now radar.

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