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Vulnerability record · CVE-2017-1000373 · published 19 June 2017

CVE-2017-1000373: Openbsd uncontrolled resource consumption vulnerability

Openbsd · Openbsd

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.

6.5 CVSS 3.0 Medium EPSS 13% · top 3.7% CWE-400 · Uncontrolled resource consumption
6.5CVSS 3.0 base score, v2 6.4
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/99177 Third Party AdvisoryVDB 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-markup MitigationThird 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.txt Third Party Advisory
http://www.securityfocus.com/bid/99177 Third Party AdvisoryVDB 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-markup MitigationThird 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.txt Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-1000373), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.