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CVE Vulnerability Details :
CVE-2025-0239
PUBLISHED
More InfoOfficial Page
Assigner-mozilla
Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe
View Known Exploited Vulnerability (KEV) details
Published At-07 Jan, 2025 | 16:07
Updated At-13 Apr, 2026 | 14:30
Rejected At-
▼CVE Numbering Authority (CNA)
Alt-Svc ALPN validation failure when redirected

When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

Affected Products
Vendor
Mozilla CorporationMozilla
Product
Firefox
Versions
Unaffected
  • From 128.6 through 128.* (rpm)
  • From 134 through * (rpm)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Unaffected
  • From 128.6 through 128.* (rpm)
  • From 134 through * (rpm)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Paul Gerste
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
N/A
https://www.mozilla.org/security/advisories/mfsa2025-01/
N/A
https://www.mozilla.org/security/advisories/mfsa2025-02/
N/A
https://www.mozilla.org/security/advisories/mfsa2025-04/
N/A
https://www.mozilla.org/security/advisories/mfsa2025-05/
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2025-01/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2025-02/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2025-04/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2025-05/
Resource: N/A
▼Authorized Data Publishers (ADP)
1. CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-295CWE-295 Improper Certificate Validation
Type: CWE
CWE ID: CWE-295
Description: CWE-295 Improper Certificate Validation
Metrics
VersionBase scoreBase severityVector
3.14.0MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Version: 3.1
Base score: 4.0
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
2. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html
N/A
Hyperlink: https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html
Resource: N/A
Details not found