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Vulnerability details: VCID-vsyy-wtk7-cbbt
Vulnerability ID VCID-vsyy-wtk7-cbbt
Aliases CVE-2021-29983
Summary Firefox for Android could get stuck in fullscreen mode and not exit it even after normal interactions that should cause it to exit. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
epss 0.00294 https://api.first.org/data/v1/epss?cve=CVE-2021-29983
archlinux High https://security.archlinux.org/AVG-2271
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-33
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-29983
AVG-2271 https://security.archlinux.org/AVG-2271
mfsa2021-33 https://www.mozilla.org/en-US/security/advisories/mfsa2021-33
No exploits are available.
Exploit Prediction Scoring System (EPSS)
Percentile 0.5261
EPSS Score 0.00294
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:17:13.553101+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-33.yml 38.0.0