{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-30872", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-06T00:04:56.698Z", "datePublished": "2026-03-19T21:56:23.472Z", "dateUpdated": "2026-03-20T19:41:00.621Z"}, "containers": {"cna": {"title": "OpenWrt Project has a Stack-based Buffer Overflow vulnerability via IPv6 reverse DNS lookup", "problemTypes": [{"descriptions": [{"cweId": "CWE-121", "lang": "en", "description": "CWE-121: Stack-based Buffer Overflow", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "baseScore": 9.5, "baseSeverity": "CRITICAL", "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", "version": "4.0"}}], "references": [{"name": "https://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5"}, {"name": "https://github.com/openwrt/openwrt/releases/tag/v24.10.6", "tags": ["x_refsource_MISC"], "url": "https://github.com/openwrt/openwrt/releases/tag/v24.10.6"}, {"name": "https://github.com/openwrt/openwrt/releases/tag/v25.12.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/openwrt/openwrt/releases/tag/v25.12.1"}], "affected": [{"vendor": "openwrt", "product": "openwrt", "versions": [{"version": ">= 25.12.0-rc1, < 25.12.1", "status": "affected"}, {"version": "< 24.10.6", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-19T21:56:23.472Z"}, "descriptions": [{"lang": "en", "value": "OpenWrt Project is a Linux operating system targeting embedded devices. 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."}], "source": {"advisory": "GHSA-mpgh-v658-jqv5", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-20T19:40:18.530222Z", "id": "CVE-2026-30872", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-20T19:41:00.621Z"}}]}}

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{"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"}