CVE-2019-11707
Mozilla Firefox and Thunderbird Type Confusion Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 13 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 37.95% probability · 99th percentile
- Public exploits
- 2 in Exploit-DB · verified · first 26 June 2019
- CISA KEV
- Listed 23 May 2022 · due 13 June 2022
- Weakness
- CWE-843
- Affected
- mozilla/firefox · mozilla/thunderbird
- Source
- security@mozilla.org
EPSS 38.0% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2019-11707
Public exploits (2)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1544386Issue Tracking, Permissions Required, Vendor Advisory
- https://security.gentoo.org/glsa/201908-12Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-18/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-20/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1544386Issue Tracking, Permissions Required, Vendor Advisory
- https://security.gentoo.org/glsa/201908-12Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-18/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-20/Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11707US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.