TI-2021-16105 Aliases CVE-2021-38505 GHSA-fw34-2587-pprf

Exposure of resource to wrong sphere in Mozilla Firefox

LOW 31CWE-668Published 2021-12-08 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-668 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.01084 65th percentileScored 2026-11-07

Fix Partial Firefox (Mozilla): 94Thunderbird (Mozilla): 91.3+1 more productRed Hat: 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Firefox	before 94	94	Patch available	CNA
Mozilla	Thunderbird	before 91.3	91.3	Patch available	CNA
Mozilla	Firefox ESR	before 91.3	91.3	Patch available	CNA

Firefox VendorMozilla Affected before 94 Fixed in 94 Patch available CNA
Thunderbird VendorMozilla Affected before 91.3 Fixed in 91.3 Patch available CNA
Firefox ESR VendorMozilla Affected before 91.3 Fixed in 91.3 Patch available CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 94.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:firefox_esr::::::::	before 91.3.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	before 91.3.0	Vulnerable	Mozilla
cpe:2.3:o:microsoft:windows_10::::::::	all versions	Running on	Microsoft

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 94.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 91.3.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 91.3.0 Vulnerable ·Mozilla
cpe:2.3:o:microsoft:windows_10:*:*:*:*:*:*:*:* Versions all versions Running on ·Microsoft

Remediation

Fix · CNA Firefox (Mozilla) Fixed in 94
Fix · CNA Thunderbird (Mozilla) Fixed in 91.3
Fix · CNA Firefox ESR (Mozilla) Fixed in 91.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2021-12-08
Mozilla Firefox 94
6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2021-16110 The executable file warning was not presented when downloading .inetloc files, which, due…Priority MEDIUM 40
- TI-2021-19420 Cross-site scripting in Mozilla FirefoxPriority LOW 30
- TI-2021-19422 Open redirect in Mozilla FirefoxPriority LOW 28
Show all 6 records →
Release · 2021-12-08
Mozilla Firefox ESR, Thunderbird 91.3
2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2021-16110 The executable file warning was not presented when downloading .inetloc files, which, due…Priority MEDIUM 40
Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope

Not affected: 3 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8

Timeline

2026-10-02 Threatist record created from CVE-2021-38505
2026-10-03 Alias added: GHSA-fw34-2587-pprf

References

Advisory 4

TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8

See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences