CVE-2026-6777
Received Received - Intake
DNS Vulnerability in Firefox 150 Networking Component Fixed

Publication date: 2026-04-21

Last updated on: 2026-04-22

Assigner: Mozilla Corporation

Description
Other issue in the Networking: DNS component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
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Meta Information
Published
2026-04-21
Last Modified
2026-04-22
Generated
2026-06-16
AI Q&A
2026-04-21
EPSS Evaluated
2026-06-14
NVD
CVE-2026-6777
EUVD
EUVD-2026-24118
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 150.0 (exc)
mozilla thunderbird to 150.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
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Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 150 or later where the issue has been fixed.

Executive Summary

This vulnerability is an issue in the Networking: DNS component of Mozilla Firefox. It was addressed and fixed in Firefox version 150.

Impact Analysis

This vulnerability affects the Networking: DNS component in Firefox and has a CVSS v3.1 base score of 5.3, indicating a medium severity. It can be exploited remotely without privileges or user interaction and impacts availability, potentially causing denial of service or disruption in network functionality.

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