CVE-2001-1559

Name: CVE-2001-1559
Creator: NVD / NIST
Published: 2001-12-31T05:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.48%

Last modified Jun 16, 2026

CVE-2001-1559 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.. EPSS estimates a 1.48% chance of exploitation in the next 30 days.

Description

The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.48%

70.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Openbsd	Openbsd	2.9
Openbsd	Openbsd	3.0

References

http://archives.neohapsis.com/archives/bugtraq/2001-12/0014.htmlBroken Link, Exploit
http://monkey.org/openbsd/archive/tech/0112/msg00015.htmlBroken Link, Exploit
http://www.iss.net/security_center/static/7690.phpBroken Link
http://archives.neohapsis.com/archives/bugtraq/2001-12/0014.htmlBroken Link, Exploit
http://monkey.org/openbsd/archive/tech/0112/msg00015.htmlBroken Link, Exploit
http://www.iss.net/security_center/static/7690.phpBroken Link

Timeline

Published: Dec 31, 2001
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2001-1559?

How severe is CVE-2001-1559?

CVE-2001-1559 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.48% probability of exploitation in the next 30 days.

How do I fix CVE-2001-1559?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2001-1559?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST