CVE-2020-6831
A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.80%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.80% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/thunderbird · canonical/ubuntu linux · debian/debian linux · opensuse/leap
- Source
- security@mozilla.org
EPSS 5.8% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.htmlThird Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1632241Permissions Required
- https://security.gentoo.org/glsa/202005-03Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202005-04Third Party Advisory
- https://usn.ubuntu.com/4373-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4714Third 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.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.htmlThird Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1632241Permissions Required
- https://security.gentoo.org/glsa/202005-03Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202005-04Third Party Advisory
- https://usn.ubuntu.com/4373-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4714Third 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.