What is the severity of CVE-2025-4087?

CVE-2025-4087 has a high severity as it can lead to out-of-bounds read access and potential memory corruption.

How do I fix CVE-2025-4087?

To fix CVE-2025-4087, update to Firefox version 138 or later, Firefox ESR version 128.10 or later, or the appropriate version for Thunderbird.

What software is affected by CVE-2025-4087?

CVE-2025-4087 affects Firefox versions prior to 138, Firefox ESR versions prior to 128.10, and Thunderbird versions prior to 138.

What kind of attacks can CVE-2025-4087 facilitate?

CVE-2025-4087 can facilitate attacks that exploit memory corruption vulnerabilities, potentially leading to system crashes or arbitrary code execution.

Is CVE-2025-4087 specific to desktop versions of the software?

CVE-2025-4087 affects desktop versions of Firefox and Thunderbird, including their ESR counterparts.

Vulnerability/
CVE-2025-4087

medium

6.5

CWE

125

29/4/2025

CVE-2025-4087

First published: Tue Apr 29 2025(Updated: )

A vulnerability was identified in Firefox where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Thunderbird < 138, and Thunderbird ESR < 128.10.

Credit: security@mozilla.org

Affected Software	Affected Version	How to fix
Firefox	<138
Firefox ESR	<128.10
Thunderbird	<138
Mozilla Thunderbird	<128.10

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2025-4087?
CVE-2025-4087 has a high severity as it can lead to out-of-bounds read access and potential memory corruption.
How do I fix CVE-2025-4087?
To fix CVE-2025-4087, update to Firefox version 138 or later, Firefox ESR version 128.10 or later, or the appropriate version for Thunderbird.
What software is affected by CVE-2025-4087?
CVE-2025-4087 affects Firefox versions prior to 138, Firefox ESR versions prior to 128.10, and Thunderbird versions prior to 138.
What kind of attacks can CVE-2025-4087 facilitate?
CVE-2025-4087 can facilitate attacks that exploit memory corruption vulnerabilities, potentially leading to system crashes or arbitrary code execution.
Is CVE-2025-4087 specific to desktop versions of the software?
CVE-2025-4087 affects desktop versions of Firefox and Thunderbird, including their ESR counterparts.

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agent/type
agent/first-publish-date
agent/description
agent/guess-ai
agent/software-canonical-lookup
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agent/author
agent/source
agent/tags
collector/nvd-api
source/NVD
agent/weakness
agent/last-modified-date
agent/severity
agent/event
vendor/mozilla
canonical/firefox
canonical/firefox esr
canonical/thunderbird
canonical/mozilla thunderbird

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