CVE-2020-6831

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 5.8%, top 8% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

May 26, 2020

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Sep 19, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 68.8.0 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-18/
generic

Security Vulnerabilities fixed in Firefox ESR 68.8 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-17/
generic

Security Vulnerabilities fixed in Firefox 76 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-16/
generic

[SECURITY] [DSA 4714-1] chromium security update

https://www.debian.org/security/2020/dsa-4714
generic

Mozilla Firefox: Multiple vulnerabilities (GLSA 202005-04) — Gentoo security

https://security.gentoo.org/glsa/202005-04
generic

Mozilla Thunderbird: Multiple vulnerabilities (GLSA 202005-03) — Gentoo security

https://security.gentoo.org/glsa/202005-03
generic

1632241 - (CVE-2020-6831) Buffer overflow in sctp chunk input validation

https://bugzilla.mozilla.org/show_bug.cgi?id=1632241
generic

Packet Storm Security

http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:68.8.0+build2-0ubuntu0.19.10.2) @ eoan2026-05-27ubuntu
ubuntufirefox-mozsymbols (76.0+build2-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
redhatthunderbird-0:68.8.0-1.el7_82020-05-11redhat
redhatthunderbird-0:68.8.0-1.el8_02020-05-11redhat
redhatthunderbird-0:68.8.0-1.el8_12020-05-11redhat
redhatthunderbird-0:68.8.0-1.el6_102020-05-11redhat
redhatchromium-browser-0:81.0.4044.138-1.el6_102020-05-11redhat
redhatthunderbird-0:68.8.0-1.el8_22020-05-11redhat
redhatfirefox-0:68.8.0-1.el7_82020-05-06redhat
redhatfirefox-0:68.8.0-1.el8_02020-05-06redhat
redhatfirefox-0:68.8.0-1.el6_102020-05-06redhat
redhatfirefox-0:68.8.0-1.el8_22020-05-06redhat
redhatfirefox-0:68.8.0-1.el8_12020-05-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(19 across 7 ecosystems)
Debian:10(3)
PackageVulnerable rangeFixed inDependents
chromium73.0.3683.75-1 ... 83.0.4103.83-1 (35 versions)83.0.4103.116-1~deb10u1—
firefox-esr60.7.2esr-1 ... 68.8.0esr-1~deb9u1 (46 versions)68.8.0esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:68.8.0-1~deb9u1 (46 versions)1:68.8.0-1~deb10u1—
Debian:11(3)
PackageVulnerable rangeFixed inDependents
chromium—83.0.4103.83-1—
firefox-esr—68.8.0esr-1—
thunderbird—1:68.8.0-1—
Debian:12(3)
PackageVulnerable rangeFixed inDependents
chromium—83.0.4103.83-1—
firefox-esr—68.8.0esr-1—
thunderbird—1:68.8.0-1—
Debian:13(3)
PackageVulnerable rangeFixed inDependents
chromium—83.0.4103.83-1—
firefox-esr—68.8.0esr-1—
thunderbird—1:68.8.0-1—
Debian:14(3)
PackageVulnerable rangeFixed inDependents
chromium—83.0.4103.83-1—
firefox-esr—68.8.0esr-1—
thunderbird—1:68.8.0-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 68.7.0esr-1~deb9u1 (190 versions)68.8.0esr-1~deb8u1—
thunderbird1.5-4 ... 1:68.7.0-1~deb9u1 (126 versions)1:68.8.0-1~deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 68.8.0esr-1~deb8u1 (153 versions)68.8.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:68.8.0-1~deb8u1 (127 versions)1:68.8.0-1~deb9u1—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(13)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 145 total refreshes for this CVE.

  1. 2026-09-19 15:37 UTCEPSS rescore
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:22 UTCEPSS rescore
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  9. 2026-09-07 11:48 UTCOSV refresh
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  23. 2026-08-20 21:01 UTCOSV refresh
  24. 2026-08-19 17:00 UTCEPSS rescore
  25. 2026-08-18 13:44 UTCEPSS rescore
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  1. 2026-08-16 14:52 UTCEPSS rescore
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  9. 2026-08-06 13:43 UTCEPSS rescore
  10. 2026-08-05 19:14 UTCEPSS rescore
  11. 2026-08-05 13:10 UTCOSV refresh
  12. 2026-08-04 15:06 UTCEPSS rescore
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  21. 2026-07-23 14:15 UTCEPSS rescore
  22. 2026-07-23 01:54 UTCEG score recompute
  23. 2026-07-22 22:40 UTCEG score recompute
  24. 2026-07-22 14:05 UTCEPSS rescore
  25. 2026-07-21 15:22 UTCEPSS rescore
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  27. 2026-07-20 17:04 UTCEPSS rescore
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  29. 2026-07-19 14:28 UTCEPSS rescore
  30. 2026-07-19 14:28 UTCEPSS rescore
  31. 2026-07-19 11:52 UTCOSV refresh
  32. 2026-07-19 02:26 UTCEPSS rescore
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  45. 2026-07-09 19:07 UTCEPSS rescore
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  54. 2026-07-02 16:57 UTCEPSS rescore
  55. 2026-07-01 20:31 UTCOSV refresh
  56. 2026-07-01 15:03 UTCEPSS rescore
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  70. 2026-06-22 14:23 UTCEPSS rescore
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  75. 2026-06-19 19:24 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-6831?
CVE-2020-6831 is a critical vulnerability published on May 26, 2020. 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.
When was CVE-2020-6831 disclosed?
CVE-2020-6831 was first published in the National Vulnerability Database on May 26, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-6831 actively exploited?
CVE-2020-6831 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.2% of all scored CVEs.
What is the CVSS score of CVE-2020-6831?
CVE-2020-6831 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-6831?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-6831, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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