{"id":"CVE-2017-17439","state":"PUBLISHED","title":"In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser","description":"In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.","publishedAt":"2017-12-06T15:00:00.000Z","updatedAt":"2024-08-05T20:51:31.511Z","severity":null,"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878144","https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887","http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html","http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html","https://github.com/heimdal/heimdal/issues/353","http://h5l.org/advisories.html?show=2017-12-08","https://www.debian.org/security/2017/dsa-4055"],"weaknesses":[],"ingestedAt":"2026-10-29T19:43:28.887Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2017/17xxx/CVE-2017-17439.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2017-17439","state":"PUBLISHED","datePublished":"2017-12-06T15:00:00.000Z","dateUpdated":"2024-08-05T20:51:31.511Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2017-12-06T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. 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