CVE-2020-6807: canonical ubuntu_linux Use After Free
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2020-6807DEBIAN-CVE-2020-6807
Published 25-03-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-6807 is a high (CVSS 8.8) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 1.47% chance of exploitation in the next 30 days, higher than 73.4% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.47%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 26 · Related 12DLA-2140-1DLA-2150-1DSA-4639-1DSA-4642-1MGASA-2020-0141MGASA-2020-0142OPENSUSE-SU-2020:0340-1OPENSUSE-SU-2020:0366-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2020:0815RHSA-2020:0816RHSA-2020:0819RHSA-2020:0820RHSA-2020:0905RHSA-2020:0914RHSA-2020:0918RHSA-2020:0919SUSE-SU-2020:0686-1SUSE-SU-2020:0717-1SUSE-SU-2020:0721-1SUSE-SU-2020:14312-1USN-4299-1USN-4328-1USN-4335-1
Timeline
- 25-03-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
When a device was changed while a stream was about to be destroyed, the <code>stream-reinit</code> task may have been executed after the stream was destroyed, causing a use-after-free 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 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 3 agree
- 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
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.47%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
0.00 pp
From 1.47% on 19-09-2026
19-09-202619-10-2026
EPSS score1.47%
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
