{"id":"CVE-2021-38003","published":"2021-11-23T22:15:07Z","modified":"2026-06-17T04:01:23Z","title":"Google Chromium V8 Memory Corruption Vulnerability","vendor":"Google","product":"Chromium V8","tier":"core","eol":null,"description":{"text":"Inappropriate implementation in V8 in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is a memory corruption bug in the V8 JavaScript engine of Google Chromium, the component of Chrome that executes scripts, stemming from an inappropriate implementation that can lead to heap corruption. A remote attacker who can get a victim to load a crafted HTML page, with no authentication required but user interaction needed, could potentially exploit the heap corruption.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:32Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.38573,"percentile":0.98574,"date":"2026-10-29","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-2021-38003","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-10-26","exploitedFirstSeen":"2021-10-26","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2021-10-26"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://decoded.avast.io/janvojtesek/dota-2-under-attack-how-a-v8-bug-was-exploited-in-the-game/","date":"2023-02-10"},{"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"},{"url":"https://cloud.google.com/blog/topics/threat-intelligence/intellexa-zero-day-exploits-continue","date":"2025-12-03"},{"url":"https://www.gendigital.com/blog/insights/research/one-click-backdoor-sogou","date":"2026-09-10"},{"url":"https://www.recordedfuture.com/blog/september-2026-cve-landscape","date":"2026-10-13"}],"evidenceTotal":8,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-755","name":"Improper Handling of Exceptional Conditions"},{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"references":[{"url":"https://chromereleases.googleblog.com/2021/10/stable-channel-update-for-desktop_28.html","tags":["Release Notes"]},{"url":"https://crbug.com/1263462","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/1263462","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-2021-38003","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: Malicious HTML page triggers drive-by browser exploitation","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page","start":74,"end":162}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1203","name":"Exploitation for Client Execution","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Heap corruption yields code execution in browser","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allowed a remote attacker to potentially exploit heap corruption","start":74,"end":138}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-24476","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-24476","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":0,"earliest":"2023-01-07","earliestUrl":"https://github.com/SpiralBL0CK/Chrome-V8-RCE-CVE-2021-38003","repos":[{"name":"SpiralBL0CK/Chrome-V8-RCE-CVE-2021-38003","url":"https://github.com/SpiralBL0CK/Chrome-V8-RCE-CVE-2021-38003","stars":39,"created":"2023-01-07"},{"name":"jamezx32/CVE-2021-38003","url":"https://github.com/jamezx32/CVE-2021-38003","stars":0,"created":"2026-10-14"}]},"first":{"date":"2023-01-07","source":"PoC-in-GitHub","url":"https://github.com/SpiralBL0CK/Chrome-V8-RCE-CVE-2021-38003"},"provenance":"source"},"exploitRefs":["https://crbug.com/1263462"],"flow":[{"stage":"exploitation","techniques":["T1189"],"provenance":"ai"},{"stage":"primary","techniques":["T1203"],"provenance":"ai"}],"timeline":[{"date":"2021-10-26","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-2021-24476","provenance":"source"},{"date":"2021-11-23","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38003","provenance":"source"},{"date":"2023-01-07","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/SpiralBL0CK/Chrome-V8-RCE-CVE-2021-38003","provenance":"source"}],"speed":{"daysToPublicExploit":410,"firstExploitFrom":"PoC-in-GitHub","daysToKev":null},"priority":{"score":68.9,"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 1829 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.71,"detail":"percentile 0.9857"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 2 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.16,"detail":"base score 8.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-google-chrome-cwe-122"}}