# CVE-2019-11707

A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.

- Page: https://www.vulneraibility.com/cve/CVE-2019-11707
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2022-05-23; CISA due date 2022-06-13
- EPSS: 37.95% (percentile 98.6)
- Public exploit code: 2 on Exploit-DB · 4 GitHub proofs of concept (first 2019-06-26)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-02-07)
- Weakness: CWE-843
- Published: 2019-07-23

## Affected versions

- Mozilla Firefox: affected < 67.0.3
- Mozilla Firefox ESR: affected < 60.7.1
- Mozilla Thunderbird: affected < 60.7.2

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.mozilla.org/security/advisories/mfsa2019-20/
- [other] https://www.mozilla.org/security/advisories/mfsa2019-18/
- [other] https://bugzilla.mozilla.org/show_bug.cgi?id=1544386
- [advisory] https://security.gentoo.org/glsa/201908-12
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11707

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.