Mozilla Thunderbird up to 128.6/134.x WebAssembly Code Generation denial of service

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.49

Summaryinfo

A vulnerability categorized as problematic has been discovered in Mozilla Thunderbird up to 128.6/134.x. Affected by this vulnerability is an unknown functionality of the component WebAssembly Code Generation. The manipulation results in denial of service. This vulnerability is cataloged as CVE-2025-1011. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Mozilla Thunderbird up to 128.6/134.x. Affected is an unknown functionality of the component WebAssembly Code Generation. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker to leverage this to achieve code execution. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

The advisory is shared for download at bugzilla.mozilla.org. This vulnerability is traded as CVE-2025-1011 since 02/04/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 214965 (Mozilla Firefox < 135.0), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 128.7 or 135 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (214965). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.6

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

NVD Base Score: 8.8
NVD Vector: 🔍

ADP CISA Base Score: 9.8
ADP CISA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: CWE-404
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: 214965
Nessus Name: Mozilla Firefox < 135.0

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Thunderbird 128.7/135

Timelineinfo

02/04/2025 🔍
02/04/2025 +0 days 🔍
02/04/2025 +0 days 🔍
10/05/2026 +608 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2025-1011 (🔍)
GCVE (CVE): GCVE-0-2025-1011
GCVE (VulDB): GCVE-100-294624

Entryinfo

Created: 02/04/2025 15:44
Updated: 10/05/2026 18:51
Changes: 02/04/2025 15:44 (56), 02/04/2025 22:11 (2), 02/05/2025 22:59 (3), 04/15/2026 08:30 (22), 09/30/2026 22:43 (3), 10/05/2026 18:51 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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