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The vulnerability in the implementation of the TLS protocol by Mozilla Firefox allows a perpetrator to circumvent existing security restrictions and gain unauthorized access to protected information.

🗓️ 27 Jun 2025 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 5 Views

Mozilla Firefox TLS certificate validation error may bypass security and expose protected information.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
FreeBSD		firefox -- multiple vulnerabilities
24 Jun 202500:00
–freebsd
ATTACKERKB		CVE-2025-6433
24 Jun 202512:28
–attackerkb
AlpineLinux		CVE-2025-6433
24 Jun 202513:15
–alpinelinux
AstraLinux		Astra Linux – Vulnerability in Firefox
16 Jun 202511:28
–astralinux
Circl		CVE-2025-6433
24 Jun 202516:29
–circl
CNNVD		Mozilla Firefox 安全漏洞
24 Jun 202500:00
–cnnvd
CVE		CVE-2025-6433
24 Jun 202512:28
–cve
Cvelist		CVE-2025-6433 WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certificate
24 Jun 202512:28
–cvelist
Debian CVE		CVE-2025-6433
24 Jun 202512:28
–debiancve
EUVD		EUVD-2025-19088
3 Oct 202520:07
–euvd
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Vulners
Node
mozillafirefoxRange<140
SourceLink
nvdwww.nvd.nist.gov/vuln/detail/CVE-2025-6433
mozillawww.mozilla.org/security/advisories/mfsa2025-51/
wikiwww.wiki.astralinux.ru/astra-linux-se18-bulletin-2025-0811SE18
wikiwww.wiki.astralinux.ru/astra-linux-se17-bulletin-2025-0923SE17
altspwww.altsp.su/obnovleniya-bezopasnosti/
xn--80ahaefyxhnwww.xn--80ahaefyxhn.xn--j1afgaq.xn--p1ai/bin/view/%D0%9E%D0%A1%D0%BD%D0%BE%D0%B2%D0%B0/%D0%9E%D0%B1%D0%BD%D0%BE%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F/2.14/
wikiwww.wiki.astralinux.ru/astra-linux-se47-bulletin-2025-1020SE47
wikiwww.wiki.astralinux.ru/astra-linux-se16-bulletin-20251225SE16
xn--80ahaefyxhnwww.xn--80ahaefyxhn.xn--j1afgaq.xn--p1ai/bin/view/%D0%9E%D0%A1%D0%BD%D0%BE%D0%B2%D0%B0/%D0%9E%D0%B1%D0%BD%D0%BE%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F/3.1/
webwww.web.nvd.nist.gov/view/vuln/detail
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04 Mar 2026 00:00Current
7.7High risk
Vulners AI Score7.7
CVSS 34.3
CVSS 25
EPSS0.00244
Mozilla FirefoxTransport Layer Securitycertificate validationsecurity bypassunauthorized accessprotected information
5