{"id":"CVE-2020-17470","aliases":["EUVD-2020-9422","GHSA-p7pr-45q9-5m9w"],"status":"published","title":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface...","description":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.02098,"percentile":0.81926,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20","CWE-330"],"published":"2020-12-11T22:40:55Z","modified":"2026-10-24T10:30:59Z","products":[{"vendor":"butok","product":"fnet"}],"references":[{"url":"https://www.kb.cert.org/vuls/id/815128","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource","advisory"]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource","advisory"]},{"url":"http://fnet.sourceforge.net/manual/fnet_history.html","tags":["x_refsource_CONFIRM","x_transferred","Release Notes","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-17470"},{"url":"https://github.com/advisories/GHSA-p7pr-45q9-5m9w"}],"sources":{"cve":[{"id":"CVE-2020-17470","description":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.","status":"published","published":"2020-12-11T22:40:55Z","modified":"2024-08-04T13:53:17.483Z","updated_at":"2026-11-02T14:35:54.80237Z"}],"euvd":[{"id":"EUVD-2020-9422","description":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.","status":"published","published":"2020-12-11T22:40:55Z","modified":"2024-08-04T13:53:17Z","updated_at":"2026-11-03T03:07:26.951665Z"}],"ghsa":[{"id":"GHSA-p7pr-45q9-5m9w","title":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface...","description":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.","status":"published","published":"2022-05-24T17:36:10Z","modified":"2023-10-12T21:30:56Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-20","CWE-330"],"updated_at":"2026-11-02T14:54:47.501822Z"}],"nvd":[{"id":"CVE-2020-17470","description":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.","status":"published","published":"2020-12-11T23:15:13.747Z","modified":"2026-06-17T02:58:59.06Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:06:27.10541Z"}],"osv":[{"id":"CVE-2020-17470","description":"An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.","status":"published","published":"2020-12-11T23:15:13.747Z","modified":"2026-10-24T10:30:59.050384282Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:15.212689Z"}]}}