{"id":"CVE-2026-36609","aliases":["EUVD-2026-34148","GHSA-wmgq-9q82-422r"],"status":"published","title":"Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication...","description":"Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00166,"percentile":0.05817,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-327","CWE-341"],"published":"2026-06-03T00:00:00Z","modified":"2026-07-22T19:10:00Z","references":[{"url":"https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36609.md"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-36609"},{"url":"https://github.com/advisories/GHSA-wmgq-9q82-422r"}],"sources":{"cve":[{"id":"CVE-2026-36609","description":"Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.","status":"published","published":"2026-06-03T00:00:00Z","modified":"2026-06-03T19:38:09.934Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"adp"}],"cwes":["CWE-341","CWE-327"],"updated_at":"2026-11-02T14:19:55.176387Z"}],"euvd":[{"id":"EUVD-2026-34148","description":"Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.","status":"published","published":"2026-06-03T00:00:00Z","modified":"2026-06-03T19:38:09Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T18:20:53.780241Z"}],"ghsa":[{"id":"GHSA-wmgq-9q82-422r","title":"Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication...","description":"Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.","status":"published","published":"2026-06-03T18:33:11Z","modified":"2026-06-03T21:31:33Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T15:08:31.387226Z"}],"nvd":[{"id":"CVE-2026-36609","description":"Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.","status":"published","published":"2026-06-03T18:16:22.063Z","modified":"2026-07-22T19:10:00.12Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"secondary"}],"cwes":["CWE-327","CWE-341"],"updated_at":"2026-11-02T14:12:22.022466Z"}]}}