CVE-2020-6800: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2020-6800 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 2.36% chance of exploitation in the next 30 days, higher than 83.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 27 · Related 13Timeline
- 02-03-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
2.36%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
0.00 pp
From 2.36% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu4 products
- firefox< 73.0.1+build1-0ubuntu0.16.04.1 | < 73.0+build3-0ubuntu0.18.04.1 | < 73.0+build3-0ubuntu1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- thunderbird< 1:68.7.0+build1-0ubuntu0.16.04.2 | < 1:68.7.0+build1-0ubuntu0.18.04.1 | < 1:68.5.0+build1-0ubuntu1
Mozilla3 products
- firefox≥ unspecified, < 73 | ≥ unspecified, < ESR68.5 | < 73.0
- firefox_esr< 68.5.0
- thunderbird≥ unspecified, < 68.5 | < 68.5.0
Debian2 products
- firefox-esr< 68.5.0esr-1
- thunderbird< 1:68.5.0-1
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 19.10
4 vendors · 10 products
