CVE-2020-6831 json
A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC.
published 2020-05-26 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27975
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.8%
- EPSS 5.8% chance of exploitation in 30 days, percentile 93%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Mozilla Firefox ESR 68.8
- Mozilla Firefox 76
- Mozilla Thunderbird 68.8.0
- chromium Debian 14, Debian 13, Debian 12 83.0.4103.83-1
- firefox-esr Debian 14, Debian 13, Debian 12 68.8.0esr-1
- thunderbird Debian 14, Debian 13, Debian 12 1:68.8.0-1
debian advisories DEBIAN-CVE-2020-6831
- firefox Ubuntu 16.04 LTS 76.0+build2-0ubuntu0.16.04.1
- firefox Ubuntu 18.04 LTS 76.0+build2-0ubuntu0.18.04.1
- firefox Ubuntu 20.04 LTS 76.0+build2-0ubuntu0.20.04.1
- thunderbird Ubuntu 16.04 LTS 1:68.8.0+build2-0ubuntu0.16.04.2
- thunderbird Ubuntu 18.04 LTS 1:68.8.0+build2-0ubuntu0.18.04.2
- thunderbird Ubuntu 20.04 LTS 1:68.8.0+build2-0ubuntu0.20.04.2
- chromium-browser Ubuntu 16.04 LTS 81.0.4044.138-0ubuntu0.16.04.1
- chromium-browser Ubuntu 18.04 LTS 81.0.4044.138-0ubuntu0.18.04.1
ubuntu advisories UBUNTU-CVE-2020-6831
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- thunderbird RHEL 7 68.8.0-1.el7_8
- thunderbird RHEL 8 68.8.0-1.el8_2
- thunderbird RHEL 6 68.8.0-1.el6_10
- firefox RHEL 7 68.8.0-1.el7_8
- firefox RHEL 6 68.8.0-1.el6_10
- firefox RHEL 8 68.8.0-1.el8_2
- chromium-browser RHEL 6 EXTRAS 81.0.4044.138-1.el6_10
- thunderbird RHEL 8.1 EUS 68.8.0-1.el8_1
red hat advisories RHSA-2020:2050RHSA-2020:2046RHSA-2020:2049RHSA-2020:2047RHSA-2020:2048RHSA-2020:2037
- MozillaThunderbird SLE Workstation Extension 15 SP1 68.8.0-3.80.2
- MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 68.8.0-109.119.1
- MozillaFirefox SLE Module for Desktop Applications 15 SP1 68.8.0-3.87.1
- MozillaFirefox SLES 11 SP4-LTSS 68.8.0-78.73.1
suse advisories SUSE-SU-2020:14359-1SUSE-SU-2020:1225-1SUSE-SU-2020:1218-1SUSE-SU-2020:1209-1
- firefox-esr openSUSE Tumbleweed 128.5.1-1.1
- MozillaFirefox openSUSE Tumbleweed 92.0-1.2
- MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
- chromium openSUSE Tumbleweed 93.0.4577.82-1.1
- chromium openSUSE Tumbleweed 113.0.5672.92-1.1
- opera openSUSE Leap 15.2 NonFree 68.0.3618.104-lp152.2.6.1
- opera openSUSE Leap 15.1 NonFree 68.0.3618.104-lp151.2.18.1
- chromium Package Hub 15 SP1 81.0.4044.138-bp151.3.82.2
opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2020:0917-1
- firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 76.0-r0
- mozjs68 Alpine 3.12 68.8.0-r0
- librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 76.0-r0
- firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +10 more 68.8.0-r0
- thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 68.8.0-r0
alpine advisories ALPINE-CVE-2020-6831
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- security.gentoo.org/glsa/202005-03 advisory
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-6831 updated cvss 9.8
usrsctp: Buffer overflow in AUTH chunk input validation
-
Red Hat Enterprise Linux 5 firefox, thunderbirdaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux AppStream (v. 8) firefox 68.8.0-1.el8_2, thunderbird 68.8.0-1.el8_2fixed: vendor fix RHSA-2020:2031
-
Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox 68.8.0-1.el8_0, thunderbird 68.8.0-1.el8_0fixed: vendor fix RHSA-2020:2033
-
Red Hat Enterprise Linux AppStream EUS (v. 8.1) firefox 68.8.0-1.el8_1, thunderbird 68.8.0-1.el8_1fixed: vendor fix RHSA-2020:2032
-
Red Hat Enterprise Linux Client (v. 7) firefox 68.8.0-1.el7_8, thunderbird 68.8.0-1.el7_8 Red Hat Enterprise Linux Client Optional (v. 7) firefox 68.8.0-1.el7_8fixed: vendor fix RHSA-2020:2037
-
Red Hat Enterprise Linux Desktop (v. 6) firefox 68.8.0-1.el6_10, thunderbird 68.8.0-1.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 68.8.0-1.el6_10fixed: vendor fix RHSA-2020:2036
-
Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 81.0.4044.138-1.el6_10fixed: vendor fix RHSA-2020:2064
-
Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 68.8.0-1.el6_10fixed: vendor fix RHSA-2020:2036
show 11 moreshow fewer
-
Red Hat Enterprise Linux HPC Node Supplementary (v. 6) chromium-browser 81.0.4044.138-1.el6_10fixed: vendor fix RHSA-2020:2064
-
Red Hat Enterprise Linux Server (v. 6) firefox 68.8.0-1.el6_10fixed: vendor fix RHSA-2020:2036
-
Red Hat Enterprise Linux Server (v. 7) firefox 68.8.0-1.el7_8fixed: vendor fix RHSA-2020:2037
-
Red Hat Enterprise Linux Server Optional (v. 6) firefox 68.8.0-1.el6_10, thunderbird 68.8.0-1.el6_10fixed: vendor fix RHSA-2020:2036
-
Red Hat Enterprise Linux Server Optional (v. 7) firefox 68.8.0-1.el7_8, thunderbird 68.8.0-1.el7_8fixed: vendor fix RHSA-2020:2037
-
Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 81.0.4044.138-1.el6_10fixed: vendor fix RHSA-2020:2064
-
Red Hat Enterprise Linux Workstation (v. 6) firefox 68.8.0-1.el6_10, thunderbird 68.8.0-1.el6_10fixed: vendor fix RHSA-2020:2036
-
Red Hat Enterprise Linux Workstation (v. 7) firefox 68.8.0-1.el7_8, thunderbird 68.8.0-1.el7_8fixed: vendor fix RHSA-2020:2037
-
Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 68.8.0-1.el6_10fixed: vendor fix RHSA-2020:2036
-
Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 68.8.0-1.el7_8fixed: vendor fix RHSA-2020:2037
-
Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 81.0.4044.138-1.el6_10fixed: vendor fix RHSA-2020:2064
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
5.80% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Mozilla Firefox ESR
- Mozilla Firefox
- Mozilla Thunderbird
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
security.gentoo.org
/glsa/202005-03
patch, third-party-advisory
-
usn.ubuntu.com
/4373-1/
vendor-advisory, third-party-advisory
-
debian.org
/security/2020/dsa-4714
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-07/msg00000.html
vendor-advisory, mailing-list, third-party-advisory
-
mozilla.org
/security/advisories/mfsa2020-18/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2020-16/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2020-17/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1632241
permissions-required
-
security.gentoo.org
/glsa/202005-04
third-party-advisory
-
packetstormsecurity.com
/files/158480/usrsctp-Stack-Buffer-Overflow.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2020-6831
- NVD CVE-2020-6831
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.