// For flags

CVE-2025-0243

firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6

Severity Score

5.3
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134 and Firefox ESR < 128.6.

Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird < 128.6.

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

Multiple vulnerabilities have been discovered in Mozilla Firefox, the worst of which can lead to arbitrary code execution. Versions greater than or equal to 128.6.0:esr are affected.

*Credits: Andrew Osmond and the Mozilla Fuzzing Team
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
None
None
Integrity
Low
Low
Availability
None
None
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2025-01-06 CVE Reserved
  • 2025-01-07 CVE Published
  • 2025-01-13 CVE Updated
  • 2025-04-05 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Mozilla
Search vendor "Mozilla"
 Firefox
Search vendor "Mozilla" for product "Firefox"
*-
Affected
Mozilla
Search vendor "Mozilla"
 Firefox Esr
Search vendor "Mozilla" for product "Firefox Esr"
*-
Affected
Mozilla
Search vendor "Mozilla"
 Thunderbird
Search vendor "Mozilla" for product "Thunderbird"
*-
Affected
Oracle
Search vendor "Oracle"
 Linux
Search vendor "Oracle" for product "Linux"
*-
Affected
Redhat
Search vendor "Redhat"
 Enterprise Linux
Search vendor "Redhat" for product "Enterprise Linux"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel Aus
Search vendor "Redhat" for product "Rhel Aus"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel E4s
Search vendor "Redhat" for product "Rhel E4s"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel Eus
Search vendor "Redhat" for product "Rhel Eus"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel Tus
Search vendor "Redhat" for product "Rhel Tus"
*-
Affected
Alma
Search vendor "Alma"
 Linux
Search vendor "Alma" for product "Linux"
*-
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
*-
Affected
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
*-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
*-
Affected
Opensuse
Search vendor "Opensuse"
 Leap
Search vendor "Opensuse" for product "Leap"
*-
Affected
Oracle
Search vendor "Oracle"
 Linux
Search vendor "Oracle" for product "Linux"
*-
Affected
Redhat
Search vendor "Redhat"
 Enterprise Linux
Search vendor "Redhat" for product "Enterprise Linux"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel Aus
Search vendor "Redhat" for product "Rhel Aus"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel E4s
Search vendor "Redhat" for product "Rhel E4s"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel Els
Search vendor "Redhat" for product "Rhel Els"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel Eus
Search vendor "Redhat" for product "Rhel Eus"
*-
Affected
Redhat
Search vendor "Redhat"
 Rhel Tus
Search vendor "Redhat" for product "Rhel Tus"
*-
Affected
Rocky
Search vendor "Rocky"
 Linux
Search vendor "Rocky" for product "Linux"
*-
Affected
Slackware
Search vendor "Slackware"
 Slackware Linux
Search vendor "Slackware" for product "Slackware Linux"
*-
Affected
Suse
Search vendor "Suse"
 Packagehub
Search vendor "Suse" for product "Packagehub"
*-
Affected
Suse
Search vendor "Suse"
 Sle-module-desktop-applications
Search vendor "Suse" for product "Sle-module-desktop-applications"
*-
Affected
Suse
Search vendor "Suse"
 Sle-we
Search vendor "Suse" for product "Sle-we"
*-
Affected
Suse
Search vendor "Suse"
 Sle Hpc-espos
Search vendor "Suse" for product "Sle Hpc-espos"
*-
Affected
Suse
Search vendor "Suse"
 Sle Hpc-ltss
Search vendor "Suse" for product "Sle Hpc-ltss"
*-
Affected
Suse
Search vendor "Suse"
 Sles-ltss-extended-security
Search vendor "Suse" for product "Sles-ltss-extended-security"
*-
Affected
Suse
Search vendor "Suse"
 Sles-ltss
Search vendor "Suse" for product "Sles-ltss"
*-
Affected
Suse
Search vendor "Suse"
 Sles Sap
Search vendor "Suse" for product "Sles Sap"
*-
Affected