How to fix CVE-2025-1931?

Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.

Is Use After Free affected by CVE-2025-1931?

CVE-2025-1931 presents notable security risk, a use-after-free vulnerability rated CVSS 7.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and consider compensating controls in the interim.

CVE-2025-1931

HIGH

2025-03-04 [email protected]

7.5

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch Released

Apr 05, 2026 - 02:30 nvd

Patch available

Analysis Generated

Mar 28, 2026 - 18:29 vuln.today

CVE Published

Mar 04, 2025 - 14:15 nvd

HIGH 7.5

Description

It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability affects Firefox < 136, Firefox ESR < 115.21, Firefox ESR < 128.8, Thunderbird < 136, and Thunderbird < 128.8.

Analysis

It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical Context

This vulnerability is classified as Use After Free (CWE-416), which allows attackers to access freed memory to execute arbitrary code or crash the application. It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability affects Firefox < 136, Firefox ESR < 115.21, Firefox ESR < 128.8, Thunderbird < 136, and Thunderbird < 128.8. Affected products include: Mozilla Firefox, Mozilla Thunderbird.

Affected Products

Mozilla Firefox, Mozilla Thunderbird.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use smart pointers or garbage-collected languages. Set pointers to NULL after freeing. Enable memory sanitizers.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.5

CVSS: +38

POC: 0

Vendor Status

CVE-2025-1931 vulnerability details – vuln.today

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CVE-2025-1931

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CVE-2025-1931

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

Affected Products

Remediation

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External POC / Exploit Code