Mozilla Thunderbird up to 143 on Windows Native Messaging API use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.9$5k-$25k0.00

Summaryinfo

A vulnerability was found in Mozilla Thunderbird up to 143 on Windows. It has been classified as critical. This impacts an unknown function of the component Native Messaging API. This manipulation causes use after free. The identification of this vulnerability is CVE-2025-11719. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Mozilla Thunderbird up to 143 on Windows. Affected by this vulnerability is an unknown code block of the component Native Messaging API. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect availability. The summary by CVE is:

Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption. This vulnerability affects Firefox < 144 and Thunderbird < 144.

The advisory is shared at bugzilla.mozilla.org. This vulnerability is known as CVE-2025-11719 since 10/13/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 11/16/2025).

Upgrading to version 144 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-2275). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • IGEL OS
  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 6.9

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Thunderbird 144

Timelineinfo

10/13/2025 CVE reserved
10/14/2025 +1 days Advisory disclosed
10/14/2025 +0 days VulDB entry created
11/16/2025 +33 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2025-11719 (🔒)
GCVE (CVE): GCVE-0-2025-11719
GCVE (VulDB): GCVE-100-328249
CERT Bund: WID-SEC-2025-2275 - Mozilla Firefox: Mehrere Schwachstellen

Entryinfo

Created: 10/14/2025 15:56
Updated: 11/16/2025 18:00
Changes: 10/14/2025 15:56 (57), 10/16/2025 05:48 (11), 11/15/2025 08:13 (1), 11/16/2025 18:00 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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