CVE-2003-0138

Version 4 of the Kerberos protocol (krb4), as used in Heimdal and other packages, allows an attacker to impersonate any principal in a realm via a chosen-plaintext attack.

Published: 2003-03-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2003-0138 is rated Moderate Risk (60.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 4.28%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2003-0138

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.64% 4.28% -1.36%
2 2025-03-30 6.82% 5.64% -1.17%
3 2025-03-29 — 6.82% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2003-0138

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2003-0138

OS Trackers for CVE-2003-0138

vendor priority summary link
debian not yet assigned CVE-2003-0138 not yet assigned priority: Debian including 2 source packages (heimdal, krb5), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2003-0138
redhat high — https://access.redhat.com/security/cve/CVE-2003-0138

Affected software / configurations for CVE-2003-0138

Vendor Product Version Raw CPE
mit kerberos 4 cpe:2.3:a:mit:kerberos:4:*:*:*:*:*:*:*

References for CVE-2003-0138

cvelogic Threat Intelligence