{"id":"CVE-2021-31010","published":"2021-08-24T19:15:24Z","modified":"2026-06-17T03:51:18Z","title":"Apple iOS, macOS, watchOS Sandbox Bypass Vulnerability","vendor":"Apple","product":"iOS, macOS, watchOS","tier":"core","eol":null,"description":{"text":"A deserialization issue was addressed through improved validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 12.5.5, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. A sandboxed process may be able to circumvent sandbox restrictions. Apple was aware of a report that this issue may have been actively exploited at the time of release..","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is a deserialization issue in the Apple iOS, macOS and watchOS platforms that allows a sandboxed process to circumvent sandbox restrictions. An attacker needs only to run code within a sandboxed process, with no authentication or user interaction required and network access enough to reach the target.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:11:25Z"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.03673,"percentile":0.89635,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2022-08-25","dueDate":"2022-09-15","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://support.apple.com/en-us/HT212804, https://support.apple.com/en-us/HT212805, https://support.apple.com/en-us/HT212806, https://support.apple.com/en-us/HT212807, https://support.apple.com/en-us/HT212824; https://nvd.nist.gov/vuln/detail/CVE-2021-31010","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-09-13","exploitedFirstSeen":"2021-09-13","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2021-09-13"},{"url":"https://support.apple.com/en-us/103147","date":"2021-09-13"},{"url":"https://support.apple.com/en-us/103148","date":"2021-09-13"},{"url":"https://support.apple.com/kb/HT212806","date":"2021-09-13"},{"url":"https://support.apple.com/kb/HT212807","date":"2021-09-13"},{"url":"https://support.apple.com/en-us/103157","date":"2021-09-23"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-08-25"},{"url":"https://storage.googleapis.com/gweb-uniblog-publish-prod/documents/Buying_Spying_-_Insights_into_Commercial_Surveillance_Vendors.pdf","date":"2024-02-06"}],"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-502","name":"Deserialization of Untrusted Data"},{"id":"CWE-20","name":"Improper Input Validation"}],"references":[{"url":"https://support.apple.com/en-us/HT212804","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212805","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212806","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212807","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212824","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212804","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212805","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212806","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212807","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212824","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31010","tags":["US Government Resource"]}],"techniques":[{"id":"T1211","name":"Exploitation for Stealth","tactics":["stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Sandbox escape is defense evasion via exploit","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"A sandboxed process may be able to circumvent sandbox restrictions","start":198,"end":264}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1068","name":"Exploitation for Privilege Escalation","tactics":["privilege-escalation"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Deserialization flaw enables privilege escalation beyond sandbox","mappingType":"primary_impact","evidence":[{"from":"description","quote":"A deserialization issue was addressed through improved validation","start":0,"end":65}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-17927","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-17927","exploited":true,"exploitedSince":"2022-08-25","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1211"],"provenance":"ai"},{"stage":"primary","techniques":["T1068"],"provenance":"ai"}],"timeline":[{"date":"2021-08-24","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31010","provenance":"source"},{"date":"2021-09-13","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","provenance":"source"},{"date":"2022-08-25","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-08-25","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-17927","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":366},"priority":{"score":61.2,"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 1872 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":17.93,"detail":"percentile 0.8963"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.25,"detail":"base score 7.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-apple-ios-macos-cwe-20"}}