Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2025-0239

Improper Certificate Validation

Published: Jan 07, 2025 | Modified: Apr 13, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
5.4 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-0239
CWEhttps://cwe.mitre.org/data/definitions/295.html

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.

Weakness

The product does not validate, or incorrectly validates, a certificate.

Affected Software

NameVendorStart VersionEnd Version
FirefoxMozilla*128.6.0 (excluding)
FirefoxMozilla*134.0 (excluding)
ThunderbirdMozilla*128.6.0 (excluding)
ThunderbirdMozilla129.0 (including)134.0 (excluding)
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHatfirefox-0:128.6.0-1.el7_9*
Red Hat Enterprise Linux 8RedHatfirefox-0:128.6.0-1.el8_10*
Red Hat Enterprise Linux 8RedHatthunderbird-0:128.6.0-3.el8_10*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatfirefox-0:128.6.0-1.el8_2*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatthunderbird-0:128.6.0-3.el8_2*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatfirefox-0:128.6.0-1.el8_4*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatthunderbird-0:128.6.0-3.el8_4*
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRedHatfirefox-0:128.6.0-1.el8_4*
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRedHatthunderbird-0:128.6.0-3.el8_4*
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRedHatfirefox-0:128.6.0-1.el8_4*
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRedHatthunderbird-0:128.6.0-3.el8_4*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatfirefox-0:128.6.0-1.el8_6*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatthunderbird-0:128.6.0-3.el8_6*
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRedHatfirefox-0:128.6.0-1.el8_6*
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRedHatthunderbird-0:128.6.0-3.el8_6*
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRedHatfirefox-0:128.6.0-1.el8_6*
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRedHatthunderbird-0:128.6.0-3.el8_6*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHatfirefox-0:128.6.0-1.el8_8*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHatthunderbird-0:128.6.0-3.el8_8*
Red Hat Enterprise Linux 9RedHatfirefox-0:128.6.0-1.el9_5*
Red Hat Enterprise Linux 9RedHatthunderbird-0:128.6.0-3.el9_5*
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRedHatfirefox-0:128.6.0-1.el9_0*
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRedHatthunderbird-0:128.6.0-3.el9_0*
Red Hat Enterprise Linux 9.2 Extended Update SupportRedHatfirefox-0:128.6.0-1.el9_2*
Red Hat Enterprise Linux 9.2 Extended Update SupportRedHatthunderbird-0:128.6.0-3.el9_2*
Red Hat Enterprise Linux 9.4 Extended Update SupportRedHatfirefox-0:128.6.0-1.el9_4*
Red Hat Enterprise Linux 9.4 Extended Update SupportRedHatthunderbird-0:128.6.0-3.el9_4*
FirefoxUbuntufocal*
Mozjs102Ubuntuesm-apps/noble*
Mozjs102Ubuntujammy*
Mozjs102Ubuntunoble*
Mozjs115Ubuntunoble*
Mozjs115Ubuntuoracular*
Mozjs115Ubuntuplucky*
Mozjs52Ubuntuesm-infra/bionic*
Mozjs52Ubuntufocal*
Mozjs68Ubuntuesm-infra/focal*
Mozjs68Ubuntufocal*
Mozjs78Ubuntujammy*
Mozjs91Ubuntujammy*
ThunderbirdUbuntujammy*

Potential Mitigations

References

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