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Vulnerability record · CVE-2020-6831 · published 26 May 2020

CVE-2020-6831: Mozilla firefox out-of-bounds write vulnerability

Mozilla · Firefox

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.

9.8 CVSS 3.1 Critical EPSS 5.8% · top 7.1% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
5.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

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.

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

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html Third Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1632241 Permissions Required
https://security.gentoo.org/glsa/202005-03 PatchThird Party Advisory
https://security.gentoo.org/glsa/202005-04 Third Party Advisory
https://usn.ubuntu.com/4373-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4714 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-16/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-17/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-18/ Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html Third Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1632241 Permissions Required
https://security.gentoo.org/glsa/202005-03 PatchThird Party Advisory
https://security.gentoo.org/glsa/202005-04 Third Party Advisory
https://usn.ubuntu.com/4373-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4714 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-16/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-17/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-18/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-6831), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.