CVE-2021-29993

Firefox for Android allowed navigations through the `intent://` protocol, which could be used to...

8.1 HighFix available

Firefox for Android allowed navigations through the intent:// protocol, which could be used to cause crashes and UI spoofs. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 92.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: High

Exploit likelihood

0.73%Up 0.1 points since Nov 3, 2021

What each source reports

NVD Score used 8.1

Record: CVE-2021-29993
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
CVSS 2.0: 5.8 MediumAV:N/AC:M/Au:N/C:N/I:P/A:P
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-29993
Updated: 2026-11-02

EUVDEUVD-2021-16452 No score

Record: EUVD-2021-16452
Updated: 2026-11-03

GitHub AdvisoriesGHSA-7926-phm6-wvh3 8.1

Firefox for Android allowed navigations through the `intent://` protocol, which could be used to...

Record: GHSA-7926-phm6-wvh3
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Updated: 2026-11-02

OSVALPINE-CVE-2021-29993 8.1

Record: ALPINE-CVE-2021-29993
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Updated: 2026-11-03

OSVopenSUSE-SU-2024:10600-1 No score

MozillaFirefox-92.0-1.2 on GA media

These are all security issues fixed in the MozillaFirefox-92.0-1.2 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:10600-1
Updated: 2026-11-02

OSVopenSUSE-SU-2024:14572-1 No score

firefox-esr-128.5.1-1.1 on GA media

These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:14572-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`firefox` Alpine:v3.15	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.16	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.17	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.18	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.19	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.20	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.21	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.22	before 92.0.1-r0	92.0.1-r0
`firefox` Alpine:v3.23	before 92.0.1-r0	92.0.1-r0
`librewolf` Alpine:v3.21	before 92.0.1-r0	92.0.1-r0

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Affected packages
Package	Affected	Fixed
`librewolf` Alpine:v3.22	before 92.0.1-r0	92.0.1-r0
`librewolf` Alpine:v3.23	before 92.0.1-r0	92.0.1-r0
`librewolf` Alpine:v3.24	before 92.0.1-r0	92.0.1-r0
`MozillaFirefox` openSUSE:Tumbleweed From an advisory covering 661 CVEs	before 92.0-1.2	92.0-1.2
`firefox-esr` openSUSE:Tumbleweed From an advisory covering 1860 CVEs	before 128.5.1-1.1	128.5.1-1.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	affected, aliases, references	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-29993 is a high vulnerability (CVSS 8.1) in Mozilla Firefox, published November 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.73%, the 54th percentile. Fixed in firefox 92.0.1-r0.

References

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Left out here: 1,666 references. The JSON record has them.