CVE-2019-9795

CRITICAL 9.8CVE-2019-9795 · Published 26/04/2019 · updated 17/06/2026

In short

CVE-2019-9795 is a CRITICAL (CVSS 9.8) vulnerability affecting firefox (mozilla), firefox esr (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 1.7%, higher than 77.2% of all vulnerabilities.
Fix: update to 66.0, 60.6 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 66.0`	`66.0`
firefox esr mozilla	`< 60.6`	`60.6`
thunderbird mozilla	`< 60.6`	`60.6`

Description

A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by malicious JavaScript to trigger a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

References

access.redhat.com/errata/RHSA-2019:0966
access.redhat.com/errata/RHSA-2019:1144
bugzilla.mozilla.org/show_bug.cgi · Issue Tracking
mozilla.org/security/advisories/mfsa2019-07 · Vendor Advisory
mozilla.org/security/advisories/mfsa2019-08 · Vendor Advisory
mozilla.org/security/advisories/mfsa2019-11 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 66.0

66.0

firefox esr

mozilla

< 60.6

60.6

thunderbird

mozilla

< 60.6

60.6

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