// For flags

CVE-2025-4093

firefox: thunderbird: Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 128.10 and Thunderbird ESR < 128.10.

Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 128.10 and Thunderbird < 128.10.

This update for MozillaFirefox fixes the following issues. Firefox Extended Support Release 128.10.0 ESR MFSA 2025-29. Potential privilege escalation in Firefox Updater WebGL shader attribute memory corruption in Firefox for macOS Process isolation bypass using 'javascript:' URI links in cross-origin frames. Potential local code execution in "copy as cURL" command Unsafe attribute access during XPath parsing. Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10.

*Credits: Andrew McCreight
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2025-04-29 CVE Reserved
  • 2025-04-29 CVE Published
  • 2025-05-01 CVE Updated
  • 2025-07-06 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
  • 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
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 Firefox Esr
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*-
Affected
Mozilla
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 Thunderbird
Search vendor "Mozilla" for product "Thunderbird"
*-
Affected
Debian
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 Debian Linux
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*-
Affected
Fedoraproject
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 Fedora
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*-
Affected
Slackware
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 Slackware Linux
Search vendor "Slackware" for product "Slackware Linux"
*-
Affected