How severe is CVE-2009-0687?

CVE-2009-0687 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2009-0687 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0687?

CVE-2009-0687 primarily affects Midnightbsd. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0687?

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-2009-0687 published?

CVE-2009-0687 was published on 2009-08-11 and last updated on 2026-06-16.

CVE-2009-0687

CVE-2009-0687 is a high-severity vulnerability in Midnightbsd with a CVSS 2.0 base score of 7.8. 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-399.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 10% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Midnightbsd
Published: 2009-08-11
Last modified: 2026-06-16

Description

The pf_test_rule function in OpenBSD Packet Filter (PF), as used in OpenBSD 4.2 through 4.5, NetBSD 5.0 before RC3, MirOS 10 and earlier, and MidnightBSD 0.3-current allows remote attackers to cause a denial of service (panic) via crafted IP packets that trigger a NULL pointer dereference during translation, related to an IPv4 packet with an ICMPv6 payload.

Frequently asked questions

What is CVE-2009-0687?: The pf_test_rule function in OpenBSD Packet Filter (PF), as used in OpenBSD 4.2 through 4.5, NetBSD 5.0 before RC3, MirOS 10 and earlier, and MidnightBSD 0.3-current allows remote attackers to cause a denial of service (panic) via crafted IP packets that trigger a NULL pointer dereference during translation, related to an IPv4 packet with an ICMPv6 payload.
How severe is CVE-2009-0687?: CVE-2009-0687 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2009-0687 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0687?: CVE-2009-0687 primarily affects Midnightbsd. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0687?: 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-2009-0687 published?: CVE-2009-0687 was published on 2009-08-11 and last updated on 2026-06-16.

References

Affected products (7)

cpe:2.3:o:midnightbsd:midnightbsd:0.3-current:*:*:*:*:*:*:*
cpe:2.3:o:mirbsd:miros:*:*:*:*:*:*:*:*
cpe:2.3:o:netbsd:netbsd:5.0:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.2:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.3:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.4:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.5:*:*:*:*:*:*:*

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