CVE•Published 2021-11-03•Modified 2026-08-19•1 article on news•4 live references•NVD data
CVE-2021-29993Mozilla · Firefox_mobile
Vulnerability data via NVD (ingested)
CVSS v3.1
8.1
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
EPSS percentile
50
Exploit Prediction Scoring System · top 50% of all CVEs
Description
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.
Timeline
Published 2021-11-03
Modified 2026-08-19
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2021-29993Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Mozilla Firefox Mobile"All exposed Mozilla Firefox Mobile instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Firefox Mobile"HTTP body or banner mentions "Firefox Mobile" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-29993Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-29993Censys host search filtered to this CVE id.
grep.app
CVE-2021-29993Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-29993GitHub code search for direct mentions.
Google dork
"CVE-2021-29993" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2021-29993 on GitHub.