Mozilla Thunderbird up to 135 memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.2$5k-$25k0.00

Summaryinfo

A vulnerability has been found in Mozilla Thunderbird up to 135 and classified as critical. The impacted element is an unknown function. This manipulation causes memory corruption. This vulnerability is registered as CVE-2025-1938. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Mozilla Thunderbird up to 135 and classified as critical. Affected by this vulnerability is an unknown part. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. 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 was fixed in Firefox 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

The advisory is shared at bugzilla.mozilla.org. This vulnerability is known as CVE-2025-1938 since 03/04/2025. 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 04/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 232115 (Linux Distros Unpatched Vulnerability : CVE-2025-1938), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 136 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (232115). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

ADP CISA Base Score: 6.5
ADP CISA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Memory corruption
CWE: 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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Nessus ID: 232115
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-1938

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Thunderbird 136

Timelineinfo

03/04/2025 🔍
03/04/2025 +0 days 🔍
03/04/2025 +0 days 🔍
04/15/2026 +407 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2025-1938 (🔍)
GCVE (CVE): GCVE-0-2025-1938
GCVE (VulDB): GCVE-100-298525

Entryinfo

Created: 03/04/2025 14:58
Updated: 04/15/2026 12:11
Changes: 03/04/2025 14:58 (55), 03/06/2025 21:34 (2), 04/15/2026 12:11 (13)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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