CVE-2020-6831

9.8 criticalEPSS 5.8%

Critical (9.8). EPSS 5.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 5.8% chance of exploitation in the next 30 days; higher than 93% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2020-05-26
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

canonical:ubuntu_linux
debian:debian_linux
mozilla:firefox
mozilla:firefox_esr
mozilla:thunderbird
opensuse:leap

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html
http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1632241
https://security.gentoo.org/glsa/202005-03
https://security.gentoo.org/glsa/202005-04

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