{"id":"CVE-2021-30554","kind":"vulnerability","aliases":["CVE-2021-30554"],"related":[],"title":"Google Chromium WebGL: Google Chromium WebGL Use-After-Free Vulnerability","description":"Google Chromium WebGL contains a use-after-free vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.\n\nCISA required action: Apply updates per vendor instructions.","summary":"A use-after-free bug in the WebGL implementation of Chromium lets a remote attacker corrupt heap memory with a crafted HTML page. Exploitation can lead to code execution inside the browser, and the flaw is listed as exploited in the wild.","severity":"high","cvss":8.8,"epss":0.07367,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Google Chromium WebGL","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["browsers","chrome","chromium","edge","exploited","opera","runtime"],"not_affected_if":["fully-patched-browser"],"how_to_check":"Open chrome://version (or edge://version, opera://about) and compare the version to the fixed release in the vendor advisory.","fix":"Update Google Chrome, Microsoft Edge, Opera and other Chromium-based browsers to the patched release named in the vendor advisory.","status":"open","published_at":"2021-07-02T19:15:07+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:39:49+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-23T21:39:49Z","model":"claude-haiku-5-5","output":{"fix":"Update Google Chrome, Microsoft Edge, Opera and other Chromium-based browsers to the patched release named in the vendor advisory.\nunknown","reach":"internet","impact":"high","summary":"A use-after-free bug in the WebGL implementation of Chromium lets a remote attacker corrupt heap memory with a crafted HTML page. Exploitation can lead to code execution inside the browser, and the flaw is listed as exploited in the wild.","category":"runtime","who_cares":["chromium","chrome","edge","opera","browsers"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code in the browser by luring a victim to a crafted page.","analyst_note":"Sources do not give fixed versions; check the Chrome Releases blog and the CISA KEV entry for the patched build number.","how_to_check":"Open chrome://version (or edge://version, opera://about) and compare the version to the fixed release in the vendor advisory.\nunknown\nunknown","needs_analyst":true,"not_affected_if":["fully-patched-browser"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000495,"input_tokens":2891,"output_tokens":411,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2021':13A,16A '-30554':14A,17A 'action':119C 'affect':99C 'allow':82C 'appli':120C 'attack':43B,85C 'browser':21B,60B,102C 'bug':33B 'chrome':22B,112C 'chromium':2A,5A,19A,23B,39B,72C,105C 'cisa':117C 'code':56B 'contain':74C 'corrupt':44B,90C 'could':98C 'craft':49B,93C 'cve':12A,15A 'edg':24B,114C 'execut':57B 'exploit':25B,52B,67B,88C 'flaw':63B 'free':10A,32B,79C 'googl':1A,4A,71C,111C 'google':18A 'heap':45B,89C 'html':50B,94C 'implement':37B 'includ':106C 'insid':58B 'instruct':124C 'lead':54B 'let':40B 'limit':109C 'list':65B 'memori':46B 'microsoft':113C 'multipl':100C 'opera':26B,116C 'page':51B,95C 'per':122C 'potenti':87C 'remot':42B,84C 'requir':118C 'runtim':27B 'updat':121C 'use':8A,30B,77C 'use-after-fre':7A,29B,76C 'util':104C 'vendor':123C 'via':91C 'vulner':11A,80C,97C 'web':101C 'webgl':3A,6A,20A,36B,73C 'wild':70B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-07-02T19:15:07+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-30554","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-30554","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T14:39:41+00:00","note":null},{"source":"epss","external_id":"CVE-2021-30554","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-30554","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2021-30554","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30554","severity":null,"published_at":"2021-07-02T19:15:07+00:00","modified_at":"2026-06-17T03:50:27+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}