{"id":"CVE-2021-38000","published":"2021-11-23T22:15:07Z","modified":"2026-06-17T04:01:23Z","title":"Google Chromium Intents Improper Input Validation Vulnerability","vendor":"Google","product":"Chromium Intents","tier":"core","eol":null,"description":{"text":"Insufficient validation of untrusted input in Intents in Google Chrome on Android prior to 95.0.4638.69 allowed a remote attacker to arbitrarily browser to a malicious URL via a crafted HTML page.","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is an improper input validation issue in the Intents component of Google Chromium, as shipped in Google Chrome on Android. A remote attacker who lures a user to a crafted HTML page can cause the browser to navigate to a malicious URL, and this requires user interaction and no prior privileges or authentication.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-31T22:21:42Z"},"cvss":{"score":6.1,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.04948,"percentile":0.92161,"date":"2026-10-31","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-38000","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-09-15","exploitedFirstSeen":"2021-09-15","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2021-09-15"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://blog.talosintelligence.com/mercenary-intellexa-predator/","date":"2023-05-25"},{"url":"https://storage.googleapis.com/gweb-uniblog-publish-prod/documents/Buying_Spying_-_Insights_into_Commercial_Surveillance_Vendors.pdf","date":"2024-02-06"}],"evidenceTotal":4,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"},{"id":"CWE-20","name":"Improper Input Validation"}],"references":[{"url":"https://chromereleases.googleblog.com/2021/10/stable-channel-update-for-desktop_28.html","tags":["Release Notes"]},{"url":"https://crbug.com/1249962","tags":["Exploit","Issue Tracking"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3W46HRT2UVHWSLZB6JZHQF6JNQWKV744/","tags":["Release Notes"]},{"url":"https://www.debian.org/security/2022/dsa-5046","tags":["Mailing List","Third Party Advisory"]},{"url":"https://chromereleases.googleblog.com/2021/10/stable-channel-update-for-desktop_28.html","tags":["Release Notes"]},{"url":"https://crbug.com/1249962","tags":["Exploit","Issue Tracking"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3W46HRT2UVHWSLZB6JZHQF6JNQWKV744/","tags":["Release Notes"]},{"url":"https://www.debian.org/security/2022/dsa-5046","tags":["Mailing List","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-38000","tags":["US Government Resource"]}],"techniques":[{"id":"T1189","name":"Drive-by Compromise","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Victim visits crafted HTML page causing drive-by redirect","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"allowed a remote attacker to arbitrarily browser to a malicious URL via a crafted HTML page","start":104,"end":195}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1204.001","name":"Malicious Link","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: User interaction required to reach malicious URL","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allowed a remote attacker to arbitrarily browser to a malicious URL via a crafted HTML page","start":104,"end":195}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-24473","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-24473","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":["https://crbug.com/1249962"],"flow":[{"stage":"exploitation","techniques":["T1189"],"provenance":"ai"},{"stage":"primary","techniques":["T1204.001"],"provenance":"ai"}],"timeline":[{"date":"2021-09-15","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","provenance":"source"},{"date":"2021-11-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2021-11-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-24473","provenance":"source"},{"date":"2021-11-23","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38000","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":62.7,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1873 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":18.43,"detail":"percentile 0.9216"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":4.27,"detail":"base score 6.1"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-google-chrome-cwe-20"}}