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Case File

CVE-2017-17439

HIGH · CVSS 7.5 EPSS 3.43% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2017-12-06 · Last synced 2026-08-04

Field Assessment

AI analysis pending.

Exhibit — Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2017-17439
Severity
HIGH
CVSS
7.5
EPSS
3.43%

Original Filing — NVD 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.