{"id":"CVE-2026-102483","kind":"vulnerability","aliases":["CVE-2026-102483"],"related":[],"title":"NTPsec ntpd: crafted NTS request lets remote attacker terminate the daemon","description":"Reachable exit in NTPsec ntpd 1.1.4 through 1.2.5 allows a remote attacker to terminate the daemon via an NTS request with excess NTS Cookie Placeholder extension fields.","summary":"NTPsec ntpd versions 1.1.4 through 1.2.5 contain a reachable exit triggered by an NTS request carrying excess NTS Cookie Placeholder extension fields. A remote attacker can use this to stop the time daemon.","severity":"high","cvss":7.5,"epss":0.00582,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","linux","ntp","ntpsec","self-hosted"],"not_affected_if":["other-ntp-implementation","version-outside-range"],"how_to_check":"- Run `ntpd --version` or `ntpq -c version` to read the installed NTPsec version.\n- Check whether NTS is enabled in the NTPsec configuration (unknown if the sources do not say which setting controls it).","fix":"- Upgrade NTPsec to a release later than `1.2.5`; the first fixed version is unknown from the sources.\n- Until patched, restrict access to the NTP service at the network edge if NTS is not needed (unknown if the sources give a specific setting).","status":"open","published_at":"2026-10-21T16:17:13+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","triaged_at":"2026-10-25T03:16:46+00:00","updated_at":"2026-10-25T03:16:46+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-25T03:16:46Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade NTPsec to a release later than `1.2.5`; the first fixed version is unknown from the sources.\n- Until patched, restrict access to the NTP service at the network edge if NTS is not needed (unknown if the sources give a specific setting).","reach":"internet","title":"NTPsec ntpd: crafted NTS request lets remote attacker terminate the daemon","impact":"low","summary":"NTPsec ntpd versions 1.1.4 through 1.2.5 contain a reachable exit triggered by an NTS request carrying excess NTS Cookie Placeholder extension fields. A remote attacker can use this to stop the time daemon.","category":"infrastructure","nicknames":[],"who_cares":["ntpsec","ntp","self-hosted","linux"],"confidence":0.6,"needs_auth":"no","worst_case":"Remote attacker stops the NTP daemon, disrupting time synchronization.","analyst_note":"Confirm whether NTS must be enabled to be reachable and find the first fixed NTPsec version in the NVD entry or the NTPsec project advisory.","how_to_check":"- Run `ntpd --version` or `ntpq -c version` to read the installed NTPsec version.\n- Check whether NTS is enabled in the NTPsec configuration (unknown if the sources do not say which setting controls it).","needs_analyst":true,"not_affected_if":["other-ntp-implementation","version-outside-range"],"who_is_affected":"Servers running NTPsec ntpd between 1.1.4 and 1.2.5 that accept NTS requests from the network are exposed, because the flaw is triggered by a remote NTS request. Systems that run other NTP implementations, or NTPsec outside this version range, are not covered by this entry.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000656,"input_tokens":3345,"output_tokens":644,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-102483':14A,17A '-2026':13A,16A '1.1.4':28B,63C '1.2.5':30B,65C 'allow':66C 'attack':8A,49B,69C 'carri':40B 'contain':31B 'cooki':43B,81C 'craft':3A 'cve':12A,15A 'daemon':11A,57B,73C 'excess':41B,79C 'exit':34B,59C 'extens':45B,83C 'field':46B,84C 'host':24B 'infrastructur':18B 'let':6A 'linux':19B 'ntp':20B 'ntpd':2A,26B,62C 'ntpsec':1A,21B,25B,61C 'nts':4A,38B,42B,76C,80C 'placehold':44B,82C 'reachabl':33B,58C 'remot':7A,48B,68C 'request':5A,39B,77C 'self':23B 'self-host':22B 'stop':54B 'termin':9A,71C 'time':56B 'trigger':35B 'use':51B 'version':27B 'via':74C","nicknames":[],"mitigations":[],"who_affected":"Servers running NTPsec ntpd between 1.1.4 and 1.2.5 that accept NTS requests from the network are exposed, because the flaw is triggered by a remote NTS request. Systems that run other NTP implementations, or NTPsec outside this version range, are not covered by this entry.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-21T16:17:13+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_by":"cve@gitlab.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-102483","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102483","severity":null,"published_at":"2026-10-21T16:17:13+00:00","modified_at":"2026-10-22T16:18:19+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"epss","external_id":"CVE-2026-102483","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-102483","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T13:15:54+00:00","fetched_at":"2026-10-24T13:15:54+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}