PT-2026-33963 · Mozilla · Thunderbird+1

B00Rito · Published 2026-04-21 · Updated 2026-04-27 · CVE-2026-6777

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 150 Thunderbird versions prior to 150

Description An issue exists in the Networking: DNS component.

Recommendations Update to version 150 for Firefox. Update to version 150 for Thunderbird.

Fix

CSRF

RCE

Resource Exhaustion

Weakness Enumeration

CWE-352

CWE-20

CWE-400

Related Identifiers

BDU:2026-06948

CVE-2026-6777

OPENSUSE-SU-2026:10626-1

Affected Products

Firefox

Thunderbird

References · 54

• https://mozilla.org/security/advisories/mfsa2026-33 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-30 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6777 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6777 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6777 · Security Note
• https://bdu.fstec.ru/vul/2026-06948 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6777 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-33 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-30 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10626-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-6777 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-6777 · Security Note
• https://suse.com/security/cve/CVE-2026-6762 · Note
• https://bugzilla.mozilla.org/show_bug.cgi?id=2022726 · Note
• https://suse.com/security/cve/CVE-2026-6760 · Note