CVE-2025-43494

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This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1. An attacker may be able to cause a persistent denial-of-service."}, {"lang": "es", "value": "Se abord\u00f3 un problema de an\u00e1lisis de encabezados de correo con comprobaciones mejoradas. Este problema se solucion\u00f3 en watchOS 26.1, iOS 18.7.2 y iPadOS 18.7.2, macOS Tahoe 26.1, visionOS 26.1, macOS Sonoma 14.8.2, macOS Sequoia 15.7.2, iOS 26.1 y iPadOS 26.1. Un atacante podr\u00eda causar una denegaci\u00f3n de servicio persistente."}], "id": "CVE-2025-43494", "lastModified": "2026-10-07T11:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "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:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-43494", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-12-16T04:56:01.440750Z", "version": "2.0.3"}}]}, "published": "2025-12-12T21:15:55.390", "references": [{"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125632"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125633"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125634"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125635"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125636"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125638"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125639"}], "sourceIdentifier": "product-security@apple.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-27T22:35:35.738838+00:00", "value": {"mitigation_remediation": ["Apply the latest iOS, iPadOS, macOS, visionOS, or watchOS update that includes the fix (e.g., iOS 18.7.2 or later, iOS 26.1 or later, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1).", "If an immediate OS update is not available, limit the connection of the device to trusted email services and block delivery of emails with suspicious header patterns through network filtering or email gateway policies.", "Validate that any third\u2011party mail clients running on the device perform strict header validation, and monitor system logs for recurring parsing errors that could indicate an attempted exploitation."], "summary": {"action": "Immediate Patch", "impact": "Persistent denial\u2011of\u2011service via mail header parsing"}, "threat_synthesis": {"affected_systems": "Apple operating systems\u2014iOS, iPadOS, macOS, visionOS, and watchOS\u2014are affected. The issue is resolved in iOS 18.7.2, iOS 26.1, iPadOS 18.7.2, iPadOS 26.1, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, visionOS 26.1, and watchOS 26.1. Systems running any earlier build of these OS families are potentially vulnerable.", "description_and_impact": "A mail header parsing issue was discovered that allows malformed headers to trigger an unhandled state in the mail processing engine, potentially causing the device or application to become unresponsive. The vulnerability can lead to a persistent denial\u2011of\u2011service condition, disrupting normal mail operations without necessarily compromising data confidentiality. The weakness corresponds to CWE\u201120 (Input Validation).", "risk_and_exploitability": "The CVSS score of 7.5 indicates high impact; the EPSS score of less than 1% suggests a currently low probability of exploitation, and the vulnerability is not listed in CISA KEV, implying no publicly known exploits. Based on the description, the likely attack vector involves delivering a maliciously crafted email that includes malformed headers to the target device\u2019s mail application, which then enters an unrecoverable state and requires a restart. This scenario requires prior network access to the target to inject the problematic email, but the exploit does not rely on network attack surface beyond mail delivery and can be performed by any sender with the ability to target a device on a network or via an open mail relay."}}}}, "created": "2025-12-14T21:15:54.022176+00:00", "title": "Mail Header Parsing Bug Causing Persistent Denial of Service", "updated": "2026-04-27T22:45:15.468459+00:00", "vendors": ["apple", "apple$PRODUCT$ios", "apple$PRODUCT$ipad_os", "apple$PRODUCT$macos", "apple$PRODUCT$macos_sequoia", "apple$PRODUCT$macos_sonoma", "apple$PRODUCT$macos_tahoe", "apple$PRODUCT$visionos", "apple$PRODUCT$watchos"]}