How severe is CVE-2004-0434?

CVE-2004-0434 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2004-0434 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0434?

CVE-2004-0434 primarily affects Heimdal Project Heimdal. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2004-0434 published?

CVE-2004-0434 was published on 2004-07-07 and last updated on 2026-06-16.

CVE-2004-0434

CVE-2004-0434 is a critical-severity vulnerability in Heimdal Project Heimdal with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-131.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-131
Affected product: Heimdal Project Heimdal
Published: 2004-07-07
Last modified: 2026-06-16

Description

k5admind (kadmind) for Heimdal allows remote attackers to execute arbitrary code via a Kerberos 4 compatibility administration request whose framing length is less than 2, which leads to a heap-based buffer overflow.

Frequently asked questions

What is CVE-2004-0434?: k5admind (kadmind) for Heimdal allows remote attackers to execute arbitrary code via a Kerberos 4 compatibility administration request whose framing length is less than 2, which leads to a heap-based buffer overflow.
How severe is CVE-2004-0434?: CVE-2004-0434 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2004-0434 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0434?: CVE-2004-0434 primarily affects Heimdal Project Heimdal. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0434?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2004-0434 published?: CVE-2004-0434 was published on 2004-07-07 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:3.0:*:*:*:*:*:*:*

More vulnerabilities in Heimdal Project Heimdal

CVE-2011-4862 — Critical (CVSS 10.0): Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT Kerberos Version 5 Applications (aka…
CVE-2022-44640 — Critical (CVSS 9.8): Heimdal before 7.7.1 allows remote attackers to execute arbitrary code because of an invalid free in the ASN.1 codec…
CVE-2022-42898 — High (CVSS 8.8): PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to…
CVE-2017-11103 — High (CVSS 8.1): Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains…
CVE-2022-3116 — High (CVSS 7.5): The Heimdal Software Kerberos 5 implementation is vulnerable to a null pointer dereferance. An attacker with network…
CVE-2022-45142 — High (CVSS 7.5): The fix for CVE-2022-3437 included changing memcmp to be constant time and a workaround for a compiler bug by adding…

All CVEs affecting Heimdal Project Heimdal →

Other CWE-131 (Incorrect Calculation of Buffer Size) vulnerabilities

CVE-2026-52955 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in…
CVE-2026-41676 — Critical (CVSS 9.8): rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78,…
CVE-2026-1949 — Critical (CVSS 9.8): Delta Electronics AS320T has incorrect calculation of the buffer size on the stack in the GET/PUT request handler of…
CVE-2026-20911 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the HuffTable::initval functionality of LibRaw Commit 0b56545 and…
CVE-2025-1861 — Critical (CVSS 9.8): In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when…
CVE-2023-5941 — Critical (CVSS 9.8): In versions of FreeBSD 12.4-RELEASE prior to 12.4-RELEASE-p7 and FreeBSD 13.2-RELEASE prior to 13.2-RELEASE-p5 the…

Browse all CWE-131 (Incorrect Calculation of Buffer Size) vulnerabilities →