Mozilla Firefox Use-After-Free Vulnerability
Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)07 Mar 2022
- Exploited in EUVD (ENISA)07 Mar 2022
- Used by ransomwareno
- EPSS above 10 %14.3%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.
Affected products
- unspecified <97.3.0
- unspecified <91.6.2
- unspecified <91.6.1
- unspecified <97.0.2
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
-
Published
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EPSS peak: 14.3%
References
Other exploited vulnerabilities from the same vendor
- CVE-2010-3765Mozilla Multiple Products Remote Code Execution Vulnerability8.8 · Background exploitation
- CVE-2024-9680Mozilla Firefox Use-After-Free Vulnerability7.6 · Background exploitation
- CVE-2016-9079Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability8.0 · Background exploitation
- CVE-2015-4495Mozilla Firefox Security Feature Bypass Vulnerability8.0 · Background exploitation
- CVE-2019-11708Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability8.1 · Background exploitation
- CVE-2019-11707Mozilla Firefox and Thunderbird Type Confusion Vulnerability7.1 · Background exploitation