CVE-2019-11707
Actively exploited. CVE-2019-11707 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2019-11707 is indexed in Exploit-DB and GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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
- 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.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2019-11707 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- Exploit-DBA public exploit is published in the Exploit-DB archive.look it up ↗
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2019-11707: Mozilla Firefox and Thunderbird Type Confusion Vulnerabilitycisa-kev · 2022-05-23
External references
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