CVE-2020-6806: canonical ubuntu_linux Out-of-bounds Read
Vulnerability summary
CVE-2020-6806 is a high (CVSS 8.8) Out-of-bounds Read vulnerability in canonical ubuntu_linux. EPSS estimates a 2.61% chance of exploitation in the next 30 days, higher than 85.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 26 · Related 12Timeline
- 25-03-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.
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
2.61%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
0.00 pp
From 2.61% 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< 74.0+build3-0ubuntu0.16.04.1 | < 74.0+build3-0ubuntu0.18.04.1 | < 74.0+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 | < 1:68.6.0+build2-0ubuntu1
Mozilla3 products
- firefox≥ unspecified, < 74 | ≥ unspecified, < ESR68.6 | < 74.0
- firefox_esr≥ unspecified, < 68.6 | < 68.6.0
- thunderbird≥ unspecified, < 68.6 | < 68.6.0
Debian2 products
- firefox-esr< 68.6.0esr-1
- thunderbird< 1:68.6.0-1
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 19.10
4 vendors · 10 products
