How severe is CVE-2004-0220?

CVE-2004-0220 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2004-0220 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0220?

CVE-2004-0220 affects Openbsd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2004-0220?

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-2004-0220 published?

CVE-2004-0220 was published on 2004-05-04 and last updated on 2026-06-16.

CVE-2004-0220

CVE-2004-0220 is a critical-severity vulnerability in Openbsd with a CVSS 2.0 base score of 10.0. 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-119.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Openbsd
Published: 2004-05-04
Last modified: 2026-06-16

Description

isakmpd in OpenBSD 3.4 and earlier allows remote attackers to cause a denial of service via an ISAKMP packet with a malformed Cert Request payload, which causes an integer underflow that is used in a malloc operation that is not properly handled, as demonstrated by the Striker ISAKMP Protocol Test Suite.

Frequently asked questions

What is CVE-2004-0220?: isakmpd in OpenBSD 3.4 and earlier allows remote attackers to cause a denial of service via an ISAKMP packet with a malformed Cert Request payload, which causes an integer underflow that is used in a malloc operation that is not properly handled, as demonstrated by the Striker ISAKMP Protocol Test Suite.
How severe is CVE-2004-0220?: CVE-2004-0220 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2004-0220 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0220?: CVE-2004-0220 affects Openbsd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2004-0220?: 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-2004-0220 published?: CVE-2004-0220 was published on 2004-05-04 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*

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