{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-30872", "tracking": { "current_release_date": "2026-03-25T04:40:04.892961Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-30872", "initial_release_date": "2026-03-20T18:20:09.769870Z", "revision_history": [ { "date": "2026-03-20T18:20:09.769870Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:20:12.520789Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-20T18:20:48.455227Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:20:51.634252Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:23:06.565253Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-20T18:23:12.617785Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-20T20:39:23.790014Z", "number": "7", "summary": "Unknown change." }, { "date": "2026-03-20T22:03:06.288035Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T22:03:11.064774Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:49:59.481600Z", "number": "10", "summary": "CVSS created.| Products connected (2).| Product Identifiers created (2)." }, { "date": "2026-03-24T20:50:03.690129Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-25T04:39:33.187030Z", "number": "12", "summary": "Unknown change." } ], "status": "interim", "version": "12" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<24.10.6", "product": { "name": "vers:unknown/<24.10.6", "product_id": "CSAFPID-5873998", "product_identification_helper": { "cpe": "cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=25.12.0-rc1|<25.12.1", "product": { "name": "vers:unknown/>=25.12.0-rc1|<25.12.1", "product_id": "CSAFPID-5873997" } }, { "category": "product_version_range", "name": "vers:unknown/>=25.12.0|<25.12.1", "product": { "name": "vers:unknown/>=25.12.0|<25.12.1", "product_id": "CSAFPID-5874022", "product_identification_helper": { "cpe": "cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "openwrt" } ], "category": "vendor", "name": "OpenWrt" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-30872", "cwe": { "id": "CWE-121", "name": "Stack-based Buffer Overflow" }, "notes": [ { "category": "description", "text": "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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30872" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/30xxx/CVE-2026-30872.json" }, { "category": "description", "text": "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.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-30872.json" }, { "category": "other", "text": "0.00095", "title": "EPSS" }, { "category": "other", "text": "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", "title": "CVSSV4" }, { "category": "other", "text": "9.5", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.2", "title": "NCSC Score" }, { "category": "other", "text": "Is related to CWE-1284 (Improper Validation of Specified Quantity in Input), There is cwe data available from source Nvd, The value of the most recent EPSS score, Is related to (a version of) an uncommon product, The value of the most recent CVSS (V3) score", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 4\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5873997", "CSAFPID-5873998", "CSAFPID-5874022" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30872" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/30xxx/CVE-2026-30872.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-30872.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/openwrt/openwrt/releases/tag/v24.10.6" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/openwrt/openwrt/releases/tag/v25.12.1" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-30872" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30872" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-5873997", "CSAFPID-5873998", "CSAFPID-5874022" ] } ], "title": "CVE-2026-30872" } ] }