8.8

CVE-2020-15669: mozilla firefox_esr Use After Free

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2020-15669DEBIAN-CVE-2020-15669
Published 01-10-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-15669 is a high (CVSS 8.8) Use After Free vulnerability in mozilla firefox_esr. EPSS estimates a 1.12% chance of exploitation in the next 30 days, higher than 65.6% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
1.12%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 20 · Related 4
DLA-2346-1DLA-2360-1DSA-4749-1DSA-4754-1MGASA-2020-0348MGASA-2020-0352

Timeline

  1. 01-10-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.12%

Chance of exploitation in the next 30 days

Percentile

66%

Versus all other CVEs

30-day change

0.00 pp

From 1.12% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.12%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • firefox-esr< 68.12.0esr-1
  • thunderbird< 1:68.12.0-1
Mozilla2 products
Ubuntu1 product
  • thunderbird< 1:78.8.1+build1-0ubuntu0.18.04.1

3 vendors · 5 products

References

9 links