CVE-2017-1000373

Name: CVE-2017-1000373
Creator: NVD / NIST
Published: 2017-06-19T16:29:00.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 13.38%

Last modified Jun 17, 2026

CVE-2017-1000373 is a vulnerability of currently unknown severity. The OpenBSD qsort() function is recursive, and not randomized, an attacker can construct a pathological input array of N elements that causes qsort() to deterministically recurse N/4 times. This allows attackers to consume arbitrary amounts of stack memory and manipulate stack memory to assist in arbitrary code execution attacks. EPSS estimates a 13.38% chance of exploitation in the next 30 days.

Description

The OpenBSD qsort() function is recursive, and not randomized, an attacker can construct a pathological input array of N elements that causes qsort() to deterministically recurse N/4 times. This allows attackers to consume arbitrary amounts of stack memory and manipulate stack memory to assist in arbitrary code execution attacks. This affects OpenBSD 6.1 and possibly earlier versions.

Metrics

EPSS Probability

13.38%

95.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Openbsd	Openbsd	<= 6.1

References

http://www.securityfocus.com/bid/99177Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039427
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/qsort.c?rev=1.15&content-type=text/x-cvsweb-markupMitigation, Third Party Advisory
https://support.apple.com/HT208112
https://support.apple.com/HT208113
https://support.apple.com/HT208115
https://support.apple.com/HT208144
https://www.exploit-db.com/exploits/42271/
https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txtThird Party Advisory
http://www.securityfocus.com/bid/99177Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039427
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/qsort.c?rev=1.15&content-type=text/x-cvsweb-markupMitigation, Third Party Advisory
https://support.apple.com/HT208112
https://support.apple.com/HT208113
https://support.apple.com/HT208115
https://support.apple.com/HT208144
https://www.exploit-db.com/exploits/42271/
https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txtThird Party Advisory

Timeline

Published: Jun 19, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-1000373?

How severe is CVE-2017-1000373?

Severity scoring for CVE-2017-1000373 is pending analysis. The EPSS model estimates a 13.38% probability of exploitation in the next 30 days.

How do I fix CVE-2017-1000373?

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-2017-1000373?

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

Scan your code now

Source: NVD / NIST