Mozilla Firefox up to 133.x Text memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.5$5k-$25k0.00

Summaryinfo

A vulnerability has been found in Mozilla Firefox up to 133.x and classified as critical. The impacted element is an unknown function of the component Text Handler. This manipulation causes memory corruption. This vulnerability is handled as CVE-2025-0241. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 133.x. It has been declared as critical. Affected by this vulnerability is an unknown part of the component Text Handler. 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 availability. The summary by CVE is:

When segmenting specially crafted text, segmentation would corrupt memory leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

It is possible to read the advisory at bugzilla.mozilla.org. This vulnerability is known as CVE-2025-0241 since 01/06/2025. 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. The technical details are unknown and an exploit is not publicly available. The pricing 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 213575 (Debian dsa-5839 : firefox-esr - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 134 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (213575) and EUVD (EUVD-2025-1573). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

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

CNA Base Score: 7.7
CNA Vector (mozilla): 🔍

ADP CISA Base Score: 7.7
ADP CISA Vector: 🔍

CVSSv2info

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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: 213575
Nessus Name: Debian dsa-5839 : firefox-esr - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox 134

Timelineinfo

01/06/2025 🔍
01/07/2025 +1 days 🔍
01/07/2025 +0 days 🔍
04/15/2026 +463 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2025-0241 (🔍)
GCVE (CVE): GCVE-0-2025-0241
GCVE (VulDB): GCVE-100-290671
EUVD: 🔍

Entryinfo

Created: 01/07/2025 18:52
Updated: 04/15/2026 04:43
Changes: 01/07/2025 18:52 (56), 01/09/2025 07:59 (2), 01/09/2025 11:43 (1), 01/31/2025 00:03 (11), 02/14/2025 18:21 (3), 11/04/2025 09:34 (1), 04/15/2026 04:43 (12)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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