CVE-2019-17026 on CISA KEV

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.

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2020-04/
• www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2020-03/
• bugzilla.mozilla.org — https://bugzilla.mozilla.org/show_bug.cgi?id=1607443
• security.gentoo.org — https://security.gentoo.org/glsa/202003-02
• usn.ubuntu.com — https://usn.ubuntu.com/4335-1/
• packetstormsecurity.com — http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confus…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Mozilla	Firefox ESR	unspecified
Mozilla	Thunderbird	unspecified
Mozilla	Firefox	unspecified

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

Open in Sigma generator →