{"cve":{"cve_id":"CVE-2026-30872","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.02221,"epss_percentile":0.81379,"epss_as_of":"2026-08-26","description":"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.","published_at":"2026-03-19T21:56:23.472000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":9.5,"cvss_v4_vector":"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","cvss_v4_severity":"CRITICAL","ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-121"],"nvd_references":["https://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5","https://github.com/openwrt/openwrt/releases/tag/v24.10.6","https://github.com/openwrt/openwrt/releases/tag/v25.12.1"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-29T23:46:59.033383Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"H","value_label":"High"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"H","value_label":"High"},{"metric":"SA","name":"Availability (Subsequent System)","value":"H","value_label":"High"}]},"affected":[{"vendor_slug":"openwrt","vendor_name":"openwrt","product_slug":"openwrt","product_name":"openwrt","version_start":">= 25.12.0-rc1, < 25.12.1","version_start_inclusive":true,"version_end":">= 25.12.0-rc1, < 25.12.1","version_end_inclusive":true,"cpe23_uri":"cve5:openwrt:openwrt:>= 25.12.0-rc1, < 25.12.1:>= 25.12.0-rc1, < 25.12.1"},{"vendor_slug":"openwrt","vendor_name":"openwrt","product_slug":"openwrt","product_name":"openwrt","version_start":"< 24.10.6","version_start_inclusive":true,"version_end":"< 24.10.6","version_end_inclusive":true,"cpe23_uri":"cve5:openwrt:openwrt:< 24.10.6:< 24.10.6"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/openwrt/openwrt/releases/tag/v24.10.6","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/openwrt/openwrt/releases/tag/v25.12.1","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-03-19T21:56:23.472000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:52:48.743441Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:48.743441Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:48.743441Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"ssvc_changed","at":"2026-06-29T23:46:59.033383Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T23:46:59.033383Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T23:46:59.033383Z","label":"SSVC decision revised","source":"vulnrichment"}]}