CVE-2019-11756: mozilla firefox Use After Free
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2019-11756
Published 08-01-2020Last modified 04-08-2024
Vulnerability summary
CVE-2019-11756 is a high (CVSS 8.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 1.49% chance of exploitation in the next 30 days, higher than 73.7% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.49%
0%100%
Low · -0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 9 · Related 4Timeline
- 08-01-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Improper refcounting of soft token session objects could cause a use-after-free and crash (likely limited to a denial of service). This vulnerability affects Firefox < 71.
CVSS metrics
3 scores · 2 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 2 agree
- OSV · UbuntuEcosystem 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
1.49%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
-0.01 pp
From 1.50% on 18-09-2026
18-09-202618-10-2026
EPSS score1.49%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu3 products
- firefox< 71.0+build5-0ubuntu0.16.04.1 | < 71.0+build5-0ubuntu0.18.04.1 | < 71.0+build5-0ubuntu1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
Mozilla1 product
- firefox< 71 | < 71.0
2 vendors · 4 products