How severe is CVE-2009-3527?

CVE-2009-3527 has a CVSS 2.0 base score of 6.9, rated medium severity.

Is CVE-2009-3527 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3527?

CVE-2009-3527 primarily affects Freebsd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3527?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-3527 published?

CVE-2009-3527 was published on 2009-10-06 and last updated on 2026-06-16.

CVE-2009-3527

CVE-2009-3527 is a medium-severity vulnerability in Freebsd with a CVSS 2.0 base score of 6.9. 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-362.

Key facts

Severity: Medium (CVSS 2.0 base score 6.9)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-362
Affected product: Freebsd
Published: 2009-10-06
Last modified: 2026-06-16

Description

Race condition in the Pipe (IPC) close function in FreeBSD 6.3 and 6.4 allows local users to cause a denial of service (crash) or gain privileges via vectors related to kqueues, which triggers a use after free, leading to a NULL pointer dereference or memory corruption.

Frequently asked questions

What is CVE-2009-3527?: Race condition in the Pipe (IPC) close function in FreeBSD 6.3 and 6.4 allows local users to cause a denial of service (crash) or gain privileges via vectors related to kqueues, which triggers a use after free, leading to a NULL pointer dereference or memory corruption.
How severe is CVE-2009-3527?: CVE-2009-3527 has a CVSS 2.0 base score of 6.9, rated medium severity.
Is CVE-2009-3527 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3527?: CVE-2009-3527 primarily affects Freebsd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3527?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-3527 published?: CVE-2009-3527 was published on 2009-10-06 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:freebsd:freebsd:6.3:*:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:6.4:*:*:*:*:*:*:*

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