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The vulnerability of the Mozilla Firefox browser and the Thunderbird email client relates to the execution of operations beyond the buffer in memory, allowing an attacker to execute arbitrary code.

🗓️ 27 Jun 2025 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 7 Views

Remote code execution via memory buffer overrun in Mozilla Firefox and Thunderbird.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
FreeBSD		firefox -- multiple vulnerabilities
24 Jun 202500:00
–freebsd
ATTACKERKB		CVE-2025-6436
24 Jun 202512:28
–attackerkb
AlpineLinux		CVE-2025-6436
24 Jun 202513:15
–alpinelinux
AstraLinux		Astra Linux – Vulnerability in Firefox
16 Jun 202511:28
–astralinux
Chainguard		CVE-2025-6436 vulnerabilities
1 Jul 202614:16
–cgr
Circl		CVE-2025-6436
24 Jun 202517:05
–circl
CNNVD		Mozilla Firefox 安全漏洞
24 Jun 202500:00
–cnnvd
CVE		CVE-2025-6436
24 Jun 202512:28
–cve
Cvelist		CVE-2025-6436 Memory safety bugs fixed in Firefox 140 and Thunderbird 140
24 Jun 202512:28
–cvelist
Debian CVE		CVE-2025-6436
24 Jun 202512:28
–debiancve
Rows per page
Vulners
Node
mozillafirefoxRange<140
OR
mozillathunderbirdRange<140
SourceLink
nvdwww.nvd.nist.gov/vuln/detail/CVE-2025-6436
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
8.2High risk
Vulners AI Score8.2
CVSS 26.1
CVSS 36.5
EPSS0.02855
mozilla firefoxthunderbird email clientmemory buffer overrunremote code execution
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