How severe is CVE-1999-0396?

CVE-1999-0396 has a CVSS 2.0 base score of 2.6, rated low severity.

Is CVE-1999-0396 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0396?

CVE-1999-0396 primarily affects Netbsd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0396?

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

When was CVE-1999-0396 published?

CVE-1999-0396 was published on 1999-02-17 and last updated on 2026-06-16.

CVE-1999-0396

CVE-1999-0396 is a low-severity vulnerability in Netbsd with a CVSS 2.0 base score of 2.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 2.0 base score 2.6)
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netbsd
Published: 1999-02-17
Last modified: 2026-06-16

Description

A race condition between the select() and accept() calls in NetBSD TCP servers allows remote attackers to cause a denial of service.

Frequently asked questions

What is CVE-1999-0396?: A race condition between the select() and accept() calls in NetBSD TCP servers allows remote attackers to cause a denial of service.
How severe is CVE-1999-0396?: CVE-1999-0396 has a CVSS 2.0 base score of 2.6, rated low severity.
Is CVE-1999-0396 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0396?: CVE-1999-0396 primarily affects Netbsd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0396?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0396 published?: CVE-1999-0396 was published on 1999-02-17 and last updated on 2026-06-16.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0396

Affected products (2)

cpe:2.3:o:netbsd:netbsd:2.0.4:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.4:*:*:*:*:*:*:*

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