CVE-2026-30872

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In versions prior to 24.10.6 and 25.12.1, the mdns daemon has a Stack-based Buffer Overflow vulnerability in the match_ipv6_addresses function, triggered when processing PTR queries for IPv6 reverse DNS domains (.ip6.arpa) received via multicast DNS on UDP port 5353. During processing, the domain name from name_buffer is copied via strcpy into a fixed 256-byte stack buffer, and then the reverse IPv6 request is extracted into a buffer of only 46 bytes (INET6_ADDRSTRLEN). Because the length of the data is never validated before this extraction, an attacker can supply input larger than 46 bytes, causing an out-of-bounds write. This allows a specially crafted DNS query to overflow the stack buffer in match_ipv6_addresses, potentially enabling remote code execution. This issue has been fixed in versions 24.10.6 and 25.12.1."}, {"lang": "es", "value": "Proyecto OpenWrt es un sistema operativo Linux dirigido a dispositivos embebidos. En versiones anteriores a la 24.10.6 y 25.12.1, el demonio mdns tiene una vulnerabilidad de desbordamiento de b\u00fafer basado en pila en la funci\u00f3n match_ipv6_addresses, que se activa al procesar consultas PTR para dominios DNS inversos IPv6 (.ip6.arpa) recibidas a trav\u00e9s de DNS multicast en el puerto UDP 5353. Durante el procesamiento, el nombre de dominio de name_buffer se copia mediante strcpy en un b\u00fafer de pila fijo de 256 bytes, y luego la solicitud IPv6 inversa se extrae en un b\u00fafer de solo 46 bytes (INET6_ADDRSTRLEN). Debido a que la longitud de los datos nunca se valida antes de esta extracci\u00f3n, un atacante puede proporcionar una entrada mayor de 46 bytes, causando una escritura fuera de l\u00edmites. Esto permite que una consulta DNS especialmente dise\u00f1ada desborde el b\u00fafer de pila en match_ipv6_addresses, lo que podr\u00eda permitir la ejecuci\u00f3n remota de c\u00f3digo. Este problema ha sido corregido en las versiones 24.10.6 y 25.12.1."}], "id": "CVE-2026-30872", "lastModified": "2026-11-03T23:17:42.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.5, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-30872", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-25T03:56:14.448125Z", "version": "2.0.3"}}]}, "published": "2026-03-19T22:16:31.797", "references": [{"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/openwrt/openwrt/releases/tag/v24.10.6"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/openwrt/openwrt/releases/tag/v25.12.1"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "OpenWrt: mdns daemon: OpenWrt mdns daemon: Remote Code Execution via stack-based buffer overflow", "id": "2449317", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449317"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1284", "details": ["A flaw was found in OpenWrt's mdns daemon. A remote attacker can exploit a stack-based buffer overflow vulnerability by sending a specially crafted DNS query. This occurs when processing IPv6 reverse DNS queries, where the system fails to validate the length of incoming data. Successful exploitation could lead to an out-of-bounds write, potentially allowing the attacker to execute arbitrary code on the affected device."], "name": "CVE-2026-30872", "public_date": "2026-03-19T21:56:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-30872\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-30872\nhttps://github.com/openwrt/openwrt/releases/tag/v24.10.6\nhttps://github.com/openwrt/openwrt/releases/tag/v25.12.1\nhttps://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5"], "threat_severity": "Critical"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[25.12.0-rc1,25.12.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,24.10.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "openwrt", "source": "cna", "vendor": "openwrt"}, "product": "openwrt", "vendor": "openwrt"}], "created": "2026-03-20T08:55:25.826405+00:00", "updated": "2026-10-25T17:45:15.662189+00:00", "vendors": ["openwrt", "openwrt$PRODUCT$openwrt"]}