Exploited vulnerability · CISA KEV

Is CVE-2022-26485 exploited? Yes: in CISA KEV since 7 Mar 2022

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

Yes. CVE-2022-26485, Mozilla Firefox Use-After-Free Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 7 Mar 2022. It affects Mozilla Firefox. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 7 Mar 2022

ransomwareNot knownno confirmed use

EPSStop 5%very likely to be exploited

severity8.8CVSS 3.1 · high

US federal due21 Mar 2022BOD 22-01 deadline

What it is

Mozilla Firefox contains a use-after-free vulnerability in XSLT parameter processing which can be exploited to perform arbitrary code execution.

Vendor	Mozilla (13 exploited CVEs in KEV)
Product	Firefox
Vulnerability	Mozilla Firefox Use-After-Free Vulnerability
Weakness	CWE-416
Published	22 Dec 2022
Added to KEV	7 Mar 2022
Reported by (CNA)	mozilla

What to do

Check whether you run it. Look for Firefox in your asset inventory, including appliances and cloud images. Stack check lists every exploited Mozilla CVE at once.
Apply the fix. Apply updates per vendor instructions.
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 22 Dec 2022.
Get told next time. Email alerts when CISA adds a CVE for Mozilla.

Other exploited CVEs in Firefox

CVE-2024-9680: Mozilla Firefox Use-After-Free Vulnerability (15 Oct 2024)
CVE-2015-4495: Mozilla Firefox Security Feature Bypass Vulnerability (25 May 2022)
CVE-2022-26486: Mozilla Firefox Use-After-Free Vulnerability (7 Mar 2022)
CVE-2013-1675: Mozilla Firefox Information Disclosure Vulnerability (3 Mar 2022)

References

nvd.nist.gov/vuln/detail/CVE-2022-26485

Questions

Is CVE-2022-26485 being exploited?

Yes. CISA added CVE-2022-26485 to the Known Exploited Vulnerabilities catalog on 7 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2022-26485 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-2022-26485?

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 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 March 2022 · Mozilla scorecard · act-now radar.

Running Mozilla in a regulated environment?

We check exposure across your estate, patch or mitigate with your team, and set up detection for what attackers do after exploiting it.

Get in touch →