6.5

CVE-2021-38505: mozilla firefox Exposure of Resource to Wrong Sphere

CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-38505
Published 08-12-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-38505 is a medium (CVSS 6.5) Exposure of Resource to Wrong Sphere vulnerability in mozilla firefox. EPSS estimates a 1.08% chance of exploitation in the next 30 days, higher than 64.9% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
1.08%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 10
OPENSUSE-SU-2021:1635-1OPENSUSE-SU-2021:3745-1OPENSUSE-SU-2021:4150-1OPENSUSE-SU-2024:11607-1OPENSUSE-SU-2024:11614-1OPENSUSE-SU-2024:14572-1

Timeline

  1. 08-12-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user's Microsoft account. *This bug only affects Firefox for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.08%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

+0.03 pp

From 1.05% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.08%

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

Ubuntu4 products
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
  • mozjs78All versions (No fix recorded)
Mozilla3 products

2 vendors · 7 products

References

8 links