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CVE-2021-29962

Firefox for Android would become unstable and hard-to-recover when a website opened too many...

4.3 MediumFix available

Firefox for Android would become unstable and hard-to-recover when a website opened too many popups. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.

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
None
Availability
Low

Exploit likelihood

0.74%Up 0.1 points since Jun 25, 2021
90%50%10%1%

What each source reports

NVD Score used 4.3

Firefox for Android would become unstable and hard-to-recover when a website opened too many popups. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.

Record
CVE-2021-29962
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-404
Updated
2026-11-02
CVE List No score

Firefox for Android would become unstable and hard-to-recover when a website opened too many popups. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.

Record
CVE-2021-29962
Updated
2026-11-02
EUVDEUVD-2021-16421 No score

Firefox for Android would become unstable and hard-to-recover when a website opened too many popups. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.

Record
EUVD-2021-16421
Updated
2026-11-03
GitHub AdvisoriesGHSA-hp43-m6jc-vrgr No score

Firefox for Android would become unstable and hard-to-recover when a website opened too many...

Firefox for Android would become unstable and hard-to-recover when a website opened too many popups. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.

Record
GHSA-hp43-m6jc-vrgr
Weakness
CWE-404
Updated
2026-11-02
OSVALPINE-CVE-2021-29962 4.3

Firefox for Android would become unstable and hard-to-recover when a website opened too many popups. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.

Record
ALPINE-CVE-2021-29962
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-03
OSVUBUNTU-CVE-2021-29962 4.3

Firefox for Android would become unstable and hard-to-recover when a website opened too many popups. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.

Record
UBUNTU-CVE-2021-29962
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
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
PackageAffectedFixed
firefox
Alpine:v3.13
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.14
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.15
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.16
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.17
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.18
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.19
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.20
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.21
 before 89.0-r0
89.0-r0
firefox
Alpine:v3.22
 before 89.0-r0
89.0-r0
Show 12 moreShow less
Affected packages
PackageAffectedFixed
firefox
Alpine:v3.23
 before 89.0-r0
89.0-r0
librewolf
Alpine:v3.21
 before 89.0-r0
89.0-r0
librewolf
Alpine:v3.22
 before 89.0-r0
89.0-r0
librewolf
Alpine:v3.23
 before 89.0-r0
89.0-r0
librewolf
Alpine:v3.24
 before 89.0-r0
89.0-r0
mozjs52
Ubuntu:18.04:LTS
 All versions, plus listed versions
52.3.1-0ubuntu352.3.1-7fakesync152.8.1-0ubuntu0.18.04.152.9.1-0ubuntu0.18.04.1
 None known
mozjs38
Ubuntu:18.04:LTS
 All versions, plus listed versions
38.8.0~repack1-0ubuntu138.8.0~repack1-0ubuntu338.8.0~repack1-0ubuntu4
 None known
mozjs68
Ubuntu:20.04:LTS
 All versions, plus listed versions
68.5.0-1~fakesync68.5.0-2~fakesync68.6.0-168.6.0-1ubuntu1
 None known
mozjs52
Ubuntu:20.04:LTS
 All versions, plus listed versions
52.9.1-1build152.9.1-1ubuntu3
 None known
mozjs78
Ubuntu:22.04:LTS
 All versions, plus listed versions
78.13.0-178.15.0-278.15.0-4ubuntu1
 None known
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
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-29962 is a medium vulnerability (CVSS 4.3) in Mozilla Firefox, published June 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.74%, the 55th percentile. Fixed in firefox 89.0-r0.

References

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Left out here: 1,669 references. The JSON record has them.

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