CVE-2020-6831

CRITICAL 9.8CVE-2020-6831 · Published 26/05/2020 · updated 17/06/2026

In short

CVE-2020-6831 is a CRITICAL (CVSS 9.8) vulnerability affecting firefox (mozilla), firefox esr (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 5.8%, higher than 93.1% of all vulnerabilities.
Fix: update to 76.0, 68.8.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 76.0`	`76.0`
firefox esr mozilla	`< 68.8.0`	`68.8.0`
thunderbird mozilla	`< 68.8.0`	`68.8.0`

Description

A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.

References

lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html · Mailing List
packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html · Third Party Advisory
bugzilla.mozilla.org/show_bug.cgi · Permissions Required
security.gentoo.org/glsa/202005-03 · Patch
security.gentoo.org/glsa/202005-04 · Third Party Advisory
usn.ubuntu.com/4373-1 · Third Party Advisory
debian.org/security/2020/dsa-4714 · Third Party Advisory
mozilla.org/security/advisories/mfsa2020-16 · Vendor Advisory
mozilla.org/security/advisories/mfsa2020-17 · Vendor Advisory
mozilla.org/security/advisories/mfsa2020-18 · Vendor Advisory

More vulnerabilities in firefox

See all →

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free

Package

Affected versions

Patched versions

firefox

mozilla

< 76.0

76.0

firefox esr

mozilla

< 68.8.0

68.8.0

thunderbird

mozilla

< 68.8.0

68.8.0

More vulnerabilities in firefox

See all →