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The vulnerability of the Mozilla Firefox browser and the Thunderbird email client, related to the transmission of confidential information in plaintext, allows attackers to gain unauthorized access to protected information.

🗓️ 01 Jun 2025 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 3 Views

A vulnerability in Mozilla Firefox and Thunderbird exposes plaintext confidential data.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
FreeBSD		Firefox -- unencrypted SNI
27 May 202500:00
–freebsd
AlpineLinux		CVE-2025-5270
27 May 202513:15
–alpinelinux
AstraLinux		Astra Linux – Vulnerability in Firefox
16 Jun 202511:28
–astralinux
Chainguard		CVE-2025-5270 vulnerabilities
7 Jan 202601:29
–cgr
Circl		CVE-2025-5270
27 May 202512:48
–circl
CNNVD		Mozilla Firefox 安全漏洞
27 May 202500:00
–cnnvd
CVE		CVE-2025-5270
27 May 202512:29
–cve
Cvelist		CVE-2025-5270 SNI was sometimes unencrypted
27 May 202512:29
–cvelist
Debian CVE		CVE-2025-5270
27 May 202512:29
–debiancve
EUVD		EUVD-2025-18106
3 Oct 202520:07
–euvd
Rows per page
Vulners
Node
mozillathunderbirdRange<139
OR
mozillafirefoxRange<139
SourceLink
mozillawww.mozilla.org/security/advisories/mfsa2025-42/
mozillawww.mozilla.org/security/advisories/mfsa2025-45/
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
Rows per page

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04 Mar 2026 00:00Current
6.1Medium risk
Vulners AI Score6.1
CVSS 37.5
CVSS 27.8
EPSS0.00234
Mozilla FirefoxThunderbirdplaintext dataconfidential data
3