CVE-2020-6822: mozilla firefox Out-of-bounds Write
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2020-6822DEBIAN-CVE-2020-6822
Published 24-04-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-6822 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in mozilla firefox. EPSS estimates a 1.32% chance of exploitation in the next 30 days, higher than 70.5% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.32%
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 27 · Related 13DLA-2170-1DLA-2172-1DSA-4655-1DSA-4656-1MGASA-2020-0163MGASA-2020-0170OPENSUSE-SU-2020:0493-1OPENSUSE-SU-2020:0520-1OPENSUSE-SU-2020:0544-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2020:1404RHSA-2020:1406RHSA-2020:1420RHSA-2020:1429RHSA-2020:1488RHSA-2020:1489RHSA-2020:1495RHSA-2020:1496SUSE-SU-2020:0971-1SUSE-SU-2020:0978-1SUSE-SU-2020:1027-1SUSE-SU-2020:14339-1USN-4323-1USN-4328-1USN-4335-1
Timeline
- 24-04-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
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
1.32%
Chance of exploitation in the next 30 days
Percentile
71%
Versus all other CVEs
30-day change
0.00 pp
From 1.32% on 19-09-2026
19-09-202619-10-2026
EPSS score1.32%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu5 products
- firefox< 75.0+build3-0ubuntu0.16.04.1 | < 75.0+build3-0ubuntu0.18.04.1 | < 75.0+build3-0ubuntu1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- thunderbird< 1:68.7.0+build1-0ubuntu0.16.04.2 | < 1:68.7.0+build1-0ubuntu0.18.04.1 | < 1:68.7.0+build1-0ubuntu1
Mozilla3 products
- firefox≥ unspecified, < 75 | < 75.0
- firefox_esr≥ unspecified, < 68.7 | < 68.7.0
- thunderbird≥ unspecified, < 68.7.0 | < 68.7.0
Debian2 products
- firefox-esr< 68.7.0esr-1
- thunderbird< 1:68.7.0-1
3 vendors · 10 products
