Log in Start free

Vulnerability · Published Dec 19, 2023 · Assigned by mozilla

CVE-2023-6862

High 8.8

In plain English

A high-severity security flaw in Firefox ESR from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)8.8High
Exploit odds (30 days)1.0%top 38.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A use-after-free was identified in the `nsDNSService::Init`. This issue appears to manifest rarely during start-up. This vulnerability affects Firefox ESR < 115.6 and Thunderbird < 115.6.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8firefox115.6.0-1.el8_9.almaALSA-2024:0012
AlmaLinux:9firefox115.6.0-1.el9_3.almaALSA-2024:0025
AlmaLinux:9firefox-x11115.6.0-1.el9_3.almaALSA-2024:0025
AlmaLinux:8thunderbird115.6.0-1.el8_9.almaALSA-2024:0003
AlmaLinux:9thunderbird115.6.0-1.el9_3.almaALSA-2024:0001
Alpine:v3.20firefox-esr115.6.0-r0ALPINE-CVE-2023-6862
Alpine:v3.21firefox-esr115.6.0-r0ALPINE-CVE-2023-6862
Alpine:v3.22firefox-esr115.6.0-r0ALPINE-CVE-2023-6862
Alpine:v3.23firefox-esr115.6.0-r0ALPINE-CVE-2023-6862
Debian:12firefox-esr115.6.0esr-1~deb12u1DEBIAN-CVE-2023-6862
Debian:12firefox-esr115.6.0esr-1~deb12u1DSA-5581-1
Debian:13firefox-esr115.6.0esr-1DEBIAN-CVE-2023-6862
Debian:14firefox-esr115.6.0esr-1DEBIAN-CVE-2023-6862
Debian:12thunderbird1:115.6.0-1~deb12u1DSA-5582-1
Debian:12thunderbird1:115.6.0-1~deb12u1DEBIAN-CVE-2023-6862
Debian:13thunderbird1:115.6.0-1DEBIAN-CVE-2023-6862
Debian:14thunderbird1:115.6.0-1DEBIAN-CVE-2023-6862
Rocky Linux:8firefox0:115.6.0-1.el8_9RLSA-2024:0012
Rocky Linux:8thunderbird0:115.6.0-1.el8_9RLSA-2024:0003
Ubuntu:22.04:LTSmozjs102no fix listedUBUNTU-CVE-2023-6862
Ubuntu:24.04:LTSmozjs102no fix listedUBUNTU-CVE-2023-6862
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2023-6862
Ubuntu:22.04:LTSmozjs91no fix listedUBUNTU-CVE-2023-6862
Ubuntu:22.04:LTSthunderbird1:115.6.0+build2-0ubuntu0.22.04.1USN-6563-1
Ubuntu:22.04:LTSthunderbird1:115.6.0+build2-0ubuntu0.22.04.1UBUNTU-CVE-2023-6862
Ubuntu:24.04:LTSthunderbird1:115.6.0+build2-0ubuntu1UBUNTU-CVE-2023-6862

Affected products (as reported)

VendorProductVersions
Mozilla Firefox ESR unspecified – before 115.6
Mozilla Thunderbird unspecified – before 115.6

References