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CVE-2019-11707: Mozilla Firefox and Thunderbird Type Confusion Vulnerability

criticalknown exploitedpublic exploitCVE-2019-11707
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Mozilla Firefox and Thunderbird contain a type confusion vulnerability that can occur when manipulating JavaScript objects due to issues in Array.pop, allowing for an exploitable crash.

CSIRTS triage

vendor: Mozillaproduct: Firefox and ThunderbirdOther
What
A type confusion vulnerability can occur when manipulating JavaScript objects, leading to an exploitable crash.
Who is affected
Users of Mozilla Firefox and Thunderbird with the affected versions.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Firefox and Thunderbird.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-05-23
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-11707

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2019-11707coverage & exploitation statusNVD · CVE.org

Recent advisories for Mozilla Firefox and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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