CVE-2000-0389

CRITICAL ⚠ Exploit

Buffer overflow in krb_rd_req function in Kerberos 4 and 5 allows remote attackers to gain root privileges.

Affects 5 products across 3 vendors.

CVSS 2.010.0
EPSS16.5%
Percentile97th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
◆ AI Analysis — automated analysis, not human-reviewed

A critical buffer overflow vulnerability exists in the krb_rd_req function of Kerberos 4 and 5, enabling remote attackers to gain root privileges.

BSID: BS-2000-GLOBAL-156179-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2000-0389?
A critical buffer overflow vulnerability exists in the krb_rd_req function of Kerberos 4 and 5, enabling remote attackers to gain root privileges.
What is the CVSS score for CVE-2000-0389?
CVE-2000-0389 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 16.5%.
Is CVE-2000-0389 actively exploited?
Public exploit available for CVE-2000-0389. Exploitation risk elevated.
How do I remediate CVE-2000-0389?
Priority: IMMEDIATE.
What systems are affected by CVE-2000-0389?
CVE-2000-0389 affects Cygnus Cygnus Network Security, Kerbnet; Mit Kerberos, Kerberos 5; Redhat Linux.
Vulnerability Details
CVE IDCVE-2000-0389
BSIDBS-2000-GLOBAL-156179-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2000-05-16
Last Modified2026-06-16
ICS Relevance0%
SourceNVD
Official Description

Buffer overflow in krb_rd_req function in Kerberos 4 and 5 allows remote attackers to gain root privileges.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is exploited by sending a specially crafted request to the krb_rd_req function, which overflows a buffer and allows for arbitrary code execution with root privileges.

Exploitation Likelihood: CRITICAL

Affected Products
VendorProductAffected Versions
Cygnus Cygnus Network Security 4.0
Cygnus Kerbnet 5.0
Mit Kerberos 4.0
Mit Kerberos 5 1.0 1.1.1 4.0
Redhat Linux 6.2
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 9657 Days
CISA known-exploitedNot in KEV catalog
Public Exploit⚠ Available — Reference
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
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