4.3

CVE-2021-23963: mozilla firefox Improper Preservation of Permissions

CVSS: 4.3v3.1MediumModified
AliasesUBUNTU-CVE-2021-23963
Published 26-02-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-23963 is a medium (CVSS 4.3) Improper Preservation of Permissions vulnerability in mozilla firefox. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.5% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.66%
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 3 · Related 3
OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:14572-1USN-4717-1

Timeline

  1. 26-02-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

When sharing geolocation during an active WebRTC share, Firefox could have reset the webRTC sharing state in the user interface, leading to loss of control over the currently granted permission. This vulnerability affects Firefox < 85.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

0.00 pp

From 0.66% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.66%

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

Ubuntu5 products
  • firefox< 85.0+build1-0ubuntu0.16.04.1 | < 85.0+build1-0ubuntu0.18.04.1 | < 85.0+build1-0ubuntu0.20.04.1
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
  • mozjs78All versions (No fix recorded)
Mozilla1 product

2 vendors · 6 products

References

6 links