CVE-2025-43276

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-43276", "assignerOrgId": "286789f9-fbc2-4510-9f9a-43facdede74c", "state": "PUBLISHED", "assignerShortName": "apple", "dateReserved": "2025-04-16T15:24:37.101Z", "datePublished": "2025-07-29T23:35:57.887Z", "dateUpdated": "2026-04-02T18:22:58.637Z"}, "containers": {"cna": {"problemTypes": [{"descriptions": [{"lang": "en", "description": "iCloud Private Relay may not activate when more than one user is logged in at the same time"}]}], "affected": [{"vendor": "Apple", "product": "macOS", "versions": [{"version": "0", "status": "affected", "lessThan": "15.6", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "A logic error was addressed with improved error handling. This issue is fixed in macOS Sequoia 15.6. iCloud Private Relay may not activate when more than one user is logged in at the same time."}], "references": [{"url": "https://support.apple.com/en-us/124149"}], "providerMetadata": {"orgId": "286789f9-fbc2-4510-9f9a-43facdede74c", "shortName": "apple", "dateUpdated": "2026-04-02T18:22:58.637Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-367", "lang": "en", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2025-08-06T16:08:17.921851Z", "id": "CVE-2025-43276", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-08-06T16:11:43.104Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://seclists.org/fulldisclosure/2025/Jul/32"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:03:58.681Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "http://seclists.org/fulldisclosure/2025/Jul/32"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:03:58.681Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-43276", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-08-06T16:08:17.921851Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-367", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-08-06T16:11:21.408Z"}}], "cna": {"affected": [{"vendor": "Apple", "product": "macOS", "versions": [{"status": "affected", "version": "unspecified", "lessThan": "15.6", "versionType": "custom"}]}], "references": [{"url": "https://support.apple.com/en-us/124149"}], "descriptions": [{"lang": "en", "value": "A logic error was addressed with improved error handling. This issue is fixed in macOS Sequoia 15.6. iCloud Private Relay may not activate when more than one user is logged in at the same time."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "iCloud Private Relay may not activate when more than one user is logged in at the same time"}]}], "providerMetadata": {"orgId": "286789f9-fbc2-4510-9f9a-43facdede74c", "shortName": "apple", "dateUpdated": "2025-07-29T23:54:50.588Z"}}}, "cveMetadata": {"cveId": "CVE-2025-43276", "state": "PUBLISHED", "dateUpdated": "2025-11-03T20:03:58.681Z", "dateReserved": "2025-04-16T15:24:37.101Z", "assignerOrgId": "286789f9-fbc2-4510-9f9a-43facdede74c", "datePublished": "2025-07-29T23:35:57.887Z", "assignerShortName": "apple"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "macOS", "vendor": "Apple", "versions": [{"lessThan": "15.6", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "product-security@apple.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "matchCriteriaId": "077E4BB7-4A8B-4D18-BCD7-2938A2B8B9C8", "versionEndExcluding": "15.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A logic error was addressed with improved error handling. This issue is fixed in macOS Sequoia 15.6. iCloud Private Relay may not activate when more than one user is logged in at the same time."}, {"lang": "es", "value": "Se solucion\u00f3 un error l\u00f3gico mejorando la gesti\u00f3n de errores. Este problema se solucion\u00f3 en macOS Sequoia 15.6. Es posible que la retransmisi\u00f3n privada de iCloud no se active si hay m\u00e1s de un usuario conectado simult\u00e1neamente."}], "id": "CVE-2025-43276", "lastModified": "2026-06-17T09:23:38.630", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-43276", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-08-06T16:08:17.921851Z", "version": "2.0.3"}}]}, "published": "2025-07-30T00:15:38.563", "references": [{"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/124149"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://seclists.org/fulldisclosure/2025/Jul/32"}], "sourceIdentifier": "product-security@apple.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-367"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-28T00:35:03.218147+00:00", "value": {"mitigation_remediation": ["Install macOS Sequoia 15.6 or newer", "If an update is not immediately possible, avoid enabling Private Relay while more than one user is logged in or restrict multi\u2011user sessions on the device", "Verify Private Relay status after login and enable it manually if it is disabled"], "summary": {"action": "Update macOS", "impact": "Denial of Private Relay"}, "threat_synthesis": {"affected_systems": "Apple macOS (Sequoia) versions prior to 15.6 are affected. The issue surfaces on systems where multiple user sessions are active simultaneously, regardless of the individual user roles.", "description_and_impact": "A logic error in macOS lets iCloud Private Relay fail to activate when more than one user account is logged in concurrently. This flaw causes the protective privacy relay to remain inactive for all users, potentially allowing network traffic to bypass encryption or routing through standard internet paths. The vulnerability does not provide code execution or elevated privileges, but it undermines the privacy guarantees of iCloud Private Relay, representing a denial or degradation of the feature.", "risk_and_exploitability": "The CVSS score is 5.3, indicating moderate severity. The EPSS score is below 1%, suggesting a low probability of exploitation in the wild. It is not listed in the CISA KEV catalog. Exploitation would likely require an environment where multiple users can log in, such as on a shared machine. An attacker could use this to prevent the activation of Private Relay, thereby stripping privacy protections during simultaneous logins, but cannot gain arbitrary code execution or system compromise."}}}}, "created": "2025-08-01T07:40:45.962354+00:00", "title": "Private Relay Non-Activation During Concurrent User Logins", "updated": "2026-04-28T00:45:17.160919+00:00", "vendors": ["apple", "apple$PRODUCT$macos", "apple$PRODUCT$macos_sequoia"]}