PT-2025-4133 · Mozilla+4 · Thunderbird+5

Zarro Boogs · Published 2025-02-04 · Updated 2026-02-02 · CVE-2025-1020

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 135 Thunderbird versions prior to 135

Description Memory safety bugs are present in Firefox and Thunderbird, with evidence of memory corruption. It is presumed that with enough effort, some of these bugs could be exploited to run arbitrary code.

Recommendations For Firefox versions prior to 135, update to version 135 or later to resolve the issue. For Thunderbird versions prior to 135, update to version 135 or later to resolve the issue.

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2025-11100

ALT-PU-2025-14599

ALT-PU-2025-3108

ALT-PU-2025-7697

BDU:2025-02308

CVE-2025-1020

OPENSUSE-SU-2025:14730-1

USN-7263-1

USN-7991-1

Affected Products

Alt Linux

Astra Linux

Firefox

Linuxmint

Thunderbird

Ubuntu

References · 160

• https://ubuntu.com/security/CVE-2025-13015 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-0887 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11711 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-1020 · Security Note
• https://ubuntu.com/security/CVE-2026-0891 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-14328 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-1020 · Security Note
• https://ubuntu.com/security/CVE-2025-8039 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11715 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-8038 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-1014 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-6434 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-0243 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-6435 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-0882 · Vendor Advisory