CVE-2019-9820: mozilla firefox Use After Free
CVSS: 9.8v3.0CriticalModified
AliasesUBUNTU-CVE-2019-9820DEBIAN-CVE-2019-9820
Published 23-07-2019Last modified 04-08-2024
Vulnerability summary
CVE-2019-9820 is a critical (CVSS 9.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 1.64% chance of exploitation in the next 30 days, higher than 75.9% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.0 (NVD)EPSS score
1.64%
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 22 · Related 10DLA-1800-1DLA-1806-1DSA-4448-1DSA-4451-1MGASA-2019-0190MGASA-2019-0191OPENSUSE-SU-2019:1534-1OPENSUSE-SU-2019:1664-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2019:1265RHSA-2019:1267RHSA-2019:1269RHSA-2019:1308RHSA-2019:1309RHSA-2019:1310SUSE-SU-2019:1388-1SUSE-SU-2019:1405-1SUSE-SU-2019:1458-1USN-3991-1USN-3997-1
Timeline
- 23-07-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A use-after-free vulnerability can occur in the chrome event handler when it is freed while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
CVSS metrics
4 scores · 3 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.64%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
0.00 pp
From 1.64% on 19-09-2026
19-09-202619-10-2026
EPSS score1.64%
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< 67.0+build2-0ubuntu0.16.04.1 | < 67.0+build2-0ubuntu0.18.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- thunderbird< 1:60.7.0+build1-0ubuntu0.16.04.1 | < 1:60.7.0+build1-0ubuntu0.18.04.1
Mozilla3 products
- firefox≥ unspecified, < 67 | < 67.0
- firefox_esr≥ unspecified, < 60.7 | < 60.7
- thunderbird≥ unspecified, < 60.7 | < 60.7.0
Debian2 products
- firefox-esr< 60.7.0esr-1
- thunderbird< 1:60.7.0-1
3 vendors · 9 products
