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Vulnerability · Published Nov 21, 2023 · Assigned by mozilla

CVE-2023-6208

High 8.8

In plain English

A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)8.8High
Exploit odds (30 days)0.9%top 40.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

When using X11, text selected by the page using the Selection API was erroneously copied into the primary selection, a temporary storage not unlike the clipboard. *This bug only affects Firefox on X11. Other systems are unaffected.* This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8firefox115.5.0-1.el8_9.alma.1ALSA-2023:7508
AlmaLinux:9firefox115.5.0-1.el9_3.alma.1ALSA-2023:7507
AlmaLinux:9firefox-x11115.5.0-1.el9_3.alma.1ALSA-2023:7507
AlmaLinux:8thunderbird115.5.0-1.el8_9.alma.1ALSA-2023:7500
AlmaLinux:9thunderbird115.5.0-1.el9_3.almaALSA-2023:7501
Alpine:v3.20firefox-esr115.5.0-r0ALPINE-CVE-2023-6208
Alpine:v3.21firefox-esr115.5.0-r0ALPINE-CVE-2023-6208
Alpine:v3.22firefox-esr115.5.0-r0ALPINE-CVE-2023-6208
Alpine:v3.23firefox-esr115.5.0-r0ALPINE-CVE-2023-6208
Alpine:v3.20thunderbird115.5.0-r0ALPINE-CVE-2023-6208
Alpine:v3.21thunderbird115.5.0-r0ALPINE-CVE-2023-6208
Alpine:v3.22thunderbird115.5.0-r0ALPINE-CVE-2023-6208
Alpine:v3.23thunderbird115.5.0-r0ALPINE-CVE-2023-6208
Debian:12firefox-esr115.5.0esr-1~deb12u1DSA-5561-1
Debian:12firefox-esr115.5.0esr-1~deb12u1DEBIAN-CVE-2023-6208
Debian:13firefox-esr115.5.0esr-1DEBIAN-CVE-2023-6208
Debian:14firefox-esr115.5.0esr-1DEBIAN-CVE-2023-6208
Debian:12thunderbird1:115.5.0-1~deb12u1DSA-5566-1
Debian:12thunderbird1:115.5.0-1~deb12u1DEBIAN-CVE-2023-6208
Debian:13thunderbird1:115.5.0-1DEBIAN-CVE-2023-6208
Debian:14thunderbird1:115.5.0-1DEBIAN-CVE-2023-6208
Rocky Linux:8thunderbird0:115.5.0-1.el8_9RLSA-2023:7500
Ubuntu:22.04:LTSmozjs102no fix listedUBUNTU-CVE-2023-6208
Ubuntu:24.04:LTSmozjs102no fix listedUBUNTU-CVE-2023-6208
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2023-6208
Ubuntu:22.04:LTSmozjs91no fix listedUBUNTU-CVE-2023-6208
Ubuntu:22.04:LTSthunderbird1:115.5.0+build1-0ubuntu0.22.04.1USN-6515-1
Ubuntu:22.04:LTSthunderbird1:115.5.0+build1-0ubuntu0.22.04.1UBUNTU-CVE-2023-6208
Ubuntu:24.04:LTSthunderbird1:115.5.0+build1-0ubuntu1UBUNTU-CVE-2023-6208

Affected products (as reported)

VendorProductVersions
Mozilla Firefox unspecified – before 120
Mozilla Firefox ESR unspecified – before 115.5.0
Mozilla Thunderbird unspecified – before 115.5

References