VulnerabilityAnalyzed
CVE-2019-17026
Mozilla Firefox And Thunderbird Type Confusion Vulnerability
KEVHIGH 8.8EPSS 46.3%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 3 May 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.
- 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
- 46.31% probability · 99th percentile
- CISA KEV
- Listed 3 November 2021 · due 3 May 2022
- Weakness
- CWE-843
- Affected
- mozilla/firefox · mozilla/thunderbird · canonical/ubuntu linux
- Source
- security@mozilla.org
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2019-17026
References
- http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.htmlExploit, Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1607443Issue Tracking
- https://security.gentoo.org/glsa/202003-02Third Party Advisory
- https://usn.ubuntu.com/4335-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-03/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-04/Vendor Advisory
- http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.htmlExploit, Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1607443Issue Tracking
- https://security.gentoo.org/glsa/202003-02Third Party Advisory
- https://usn.ubuntu.com/4335-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-03/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-04/Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17026US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.