{"id":"CVE-2021-47854","aliases":["EUVD-2026-3629","GHSA-fmvf-xj4m-jpwf"],"status":"published","title":"DD-WRT 45723 - UPNP Buffer Overflow","description":"DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01082,"percentile":0.6545,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2026-01-21T17:27:38Z","modified":"2026-07-28T01:47:25Z","products":[{"vendor":"embedd gmbh","product":"dd-wrt"}],"references":[{"url":"https://www.exploit-db.com/exploits/49730","tags":["exploit"]},{"url":"https://dd-wrt.com/","tags":["product"]},{"url":"https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/","tags":["product"]},{"url":"https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/","tags":["technical-description"]},{"url":"https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47854"},{"url":"https://dd-wrt.com"},{"url":"https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021"},{"url":"https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow"},{"url":"https://github.com/advisories/GHSA-fmvf-xj4m-jpwf"}],"sources":{"cve":[{"id":"CVE-2021-47854","title":"DD-WRT 45723 - UPNP Buffer Overflow","description":"DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.","status":"published","published":"2026-01-21T17:27:38.228Z","modified":"2026-07-28T01:47:25.803Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:32:56.308189Z"}],"euvd":[{"id":"EUVD-2026-3629","description":"DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.","status":"published","published":"2026-01-21T17:27:38Z","modified":"2026-07-28T01:47:25Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:02:32.984181Z"}],"ghsa":[{"id":"GHSA-fmvf-xj4m-jpwf","title":"DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery...","description":"DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.","status":"published","published":"2026-01-21T18:30:31Z","modified":"2026-01-21T18:30:39Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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","level":"high"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T15:05:50.792909Z"}],"nvd":[{"id":"CVE-2021-47854","description":"DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.","status":"published","published":"2026-01-21T18:16:15.003Z","modified":"2026-06-17T04:18:38.093Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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","level":"high","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:07:09.005706Z"}]}}