What’s Vulnerable › Vulnerabilities

CVE-2020-6831

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-05-26 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.10, 20.04
• Debian Linux: 9.0, 10.0
• Mozilla Firefox: before 76.0 — fixed in 76.0
• Mozilla Firefox ESR: before 68.8.0 — fixed in 68.8.0
• Mozilla Thunderbird: before 68.8.0 — fixed in 68.8.0
• openSUSE Leap: 15.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 76.0; Mozilla Firefox ESR 68.8.0; Mozilla Thunderbird 68.8.0. Check the vendor advisory for mitigations.

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
• https://usn.ubuntu.com/4373-1/
• https://www.debian.org/security/2020/dsa-4714
• https://www.mozilla.org/security/advisories/mfsa2020-16/
• https://www.mozilla.org/security/advisories/mfsa2020-17/
• https://www.mozilla.org/security/advisories/mfsa2020-18/
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html
• http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html

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