How severe is CVE-2004-1799?

CVE-2004-1799 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2004-1799 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-1799?

CVE-2004-1799 primarily affects Openbsd. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-1799?

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

When was CVE-2004-1799 published?

CVE-2004-1799 was published on 2004-12-31 and last updated on 2026-06-16.

CVE-2004-1799

CVE-2004-1799 is a high-severity vulnerability in Openbsd with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Openbsd
Published: 2004-12-31
Last modified: 2026-06-16

Description

PF in certain OpenBSD versions, when stateful filtering is enabled, does not limit packets for a session to the original interface, which allows remote attackers to bypass intended packet filters via spoofed packets to other interfaces.

Frequently asked questions

What is CVE-2004-1799?: PF in certain OpenBSD versions, when stateful filtering is enabled, does not limit packets for a session to the original interface, which allows remote attackers to bypass intended packet filters via spoofed packets to other interfaces.
How severe is CVE-2004-1799?: CVE-2004-1799 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2004-1799 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-1799?: CVE-2004-1799 primarily affects Openbsd. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-1799?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2004-1799 published?: CVE-2004-1799 was published on 2004-12-31 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:o:openbsd:openbsd:3.0:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.1:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.2:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.3:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.4:*:*:*:*:*:*:*

More vulnerabilities in Openbsd

CVE-2007-1365 — Critical (CVSS 10.0): Buffer overflow in kern/uipc_mbuf2.c in OpenBSD 3.9 and 4.0 allows remote attackers to execute arbitrary code via…
CVE-2006-4304 — Critical (CVSS 10.0): Buffer overflow in the sppp driver in FreeBSD 4.11 through 6.1, NetBSD 2.0 through 4.0 beta before 20060823, and…
CVE-2004-0492 — Critical (CVSS 10.0): Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a…
CVE-2004-0414 — Critical (CVSS 10.0): CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, does not properly handle malformed "Entry" lines, which prevents…
CVE-2004-0416 — Critical (CVSS 10.0): Double free vulnerability for the error_prog_name string in CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, may…
CVE-2004-0418 — Critical (CVSS 10.0): serve_notify in CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, does not properly handle empty data lines, which…

All CVEs affecting Openbsd →