{"id":"CVE-2026-102551","aliases":["EUVD-2026-103021","GHSA-pjq5-fqrr-g6pv"],"status":"published","title":"Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling","description":"Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement.\n\n\n\nTo remediate this issue, users should upgrade to version V4.4.2.","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00273,"percentile":0.1994,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-940"],"published":"2026-10-16T17:27:38Z","modified":"2026-10-28T02:31:01Z","products":[{"vendor":"aws","product":"freertos-plus-tcp"},{"vendor":"freertos","product":"freertos-plus-tcp"}],"references":[{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2","tags":["release-notes","patch","fix"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-139-aws/","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-pjq5-fqrr-g6pv","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102551.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102551","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-102551","title":"Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling","description":"Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement.\n\n\n\nTo remediate this issue, users should upgrade to version V4.4.2.","status":"published","published":"2026-10-16T17:27:38.483Z","modified":"2026-10-19T12:51:13.488Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"},{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-940"],"updated_at":"2026-11-02T13:38:43.260938Z"}],"euvd":[{"id":"EUVD-2026-103021","description":"Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement.\n\n\n\nTo remediate this issue, users should upgrade to version V4.4.2.","status":"published","published":"2026-10-16T17:27:38Z","modified":"2026-10-19T12:51:13Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T16:59:51.629031Z"}],"nvd":[{"id":"CVE-2026-102551","description":"Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement.\n\n\n\nTo remediate this issue, users should upgrade to version V4.4.2.","status":"published","published":"2026-10-16T18:17:14.75Z","modified":"2026-10-19T13:16:53.353Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/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":"critical","assessor":"secondary"},{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high","assessor":"secondary"}],"cwes":["CWE-940"],"updated_at":"2026-11-02T14:13:00.123071Z"}],"osv":[{"id":"CVE-2026-102551","title":"Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling","description":"Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement.\n\n\n\nTo remediate this issue, users should upgrade to version V4.4.2.","status":"published","published":"2026-10-16T17:27:38.483Z","modified":"2026-10-28T02:31:01.733136454Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-940"],"updated_at":"2026-11-02T15:44:53.83521Z"}]}}