{"id":"CVE-2021-30657","published":"2021-09-08T15:15:13Z","modified":"2026-06-17T03:50:38Z","title":"Apple macOS Unspecified Vulnerability","vendor":"Apple","product":"macOS","tier":"core","eol":null,"description":{"text":"A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application may bypass Gatekeeper checks. Apple is aware of a report that this issue may have been actively exploited..","provenance":"source","from":"NVD"},"summary":{"text":"Apple macOS contains a logic flaw in its state management that allows a malicious application to bypass Gatekeeper checks, fixed in macOS Big Sur 11.3 and Security Update 2021-002 Catalina. An attacker needs a local presence on the system and must get a user to run the malicious application, with no authentication required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:12:13Z"},"cvss":{"score":5.5,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.68531,"percentile":0.99335,"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-2021-30657","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-04-26","exploitedFirstSeen":"2021-04-26","ransomware":false,"evidence":[{"url":"https://support.apple.com/kb/HT212325","date":"2021-04-26"},{"url":"https://support.apple.com/kb/HT212326","date":"2021-04-26"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"}],"evidenceTotal":3,"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-862","name":"Missing Authorization"}],"references":[{"url":"https://support.apple.com/en-us/HT212325","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212326","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212325","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212326","tags":["Release Notes","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30657","tags":["Third Party Advisory","US Government Resource"]}],"techniques":[{"id":"T1204.002","name":"Malicious File","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: user runs malicious application to trigger bypass","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"A malicious application may bypass Gatekeeper checks","start":138,"end":190}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1553.001","name":"Gatekeeper Bypass","tactics":["defense-impairment"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: bypasses Gatekeeper code-signing/quarantine protections","mappingType":"primary_impact","evidence":[{"from":"description","quote":"A malicious application may bypass Gatekeeper checks","start":138,"end":190}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-439c7e24332b59504cff","title":"Shlayer malware abusing Gatekeeper bypass on macOS","publisher":"jamf.com","url":"https://www.jamf.com/blog/shlayer-malware-abusing-gatekeeper-bypass-on-macos/","date":null,"mentions":[{"quote":"This new variant found no longer requires the right-click method since the malware comes packaged in the format required to abuse CVE-2021-30657.","start":4140,"end":4285},{"quote":"Due to the file path layout in which this script is set up, double-clicking the install icon executes the script held within 1302.app and bypasses the checks performed by Gatekeeper, described in further detail in CVE-2021-30657.","start":4884,"end":5113}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-17574","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-17574","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2021-11-07","earliestUrl":"https://github.com/shubham0d/CVE-2021-30657","repos":[{"name":"shubham0d/CVE-2021-30657","url":"https://github.com/shubham0d/CVE-2021-30657","stars":29,"created":"2021-11-07"}]},"metasploit":[{"name":"macOS Gatekeeper check bypass","module":"exploit/osx/browser/osx_gatekeeper_bypass","type":"exploit","disclosureDate":"2021-03-25","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/osx/browser/osx_gatekeeper_bypass.rb"}],"first":{"date":"2021-03-25","source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/osx/browser/osx_gatekeeper_bypass.rb"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1204.002"],"provenance":"ai"},{"stage":"primary","techniques":["T1553.001"],"provenance":"ai"}],"timeline":[{"date":"2021-03-25","kind":"exploit-public","label":"First public exploit: Metasploit; later: PoC-in-GitHub 2021-11-07","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/osx/browser/osx_gatekeeper_bypass.rb","provenance":"source"},{"date":"2021-04-26","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://support.apple.com/kb/HT212325","provenance":"source"},{"date":"2021-09-08","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30657","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-2021-17574","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":"Metasploit","daysToKev":56},"priority":{"score":70.6,"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 2012 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.87,"detail":"percentile 0.9933"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":5.0,"detail":"1 PoC-in-GitHub repo; 1 Metasploit module"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":3.85,"detail":"base score 5.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-apple-ios-macos-cwe-862"}}