CVE-2017-5850

HIGH

OpenBSD httpd - Denial of Service via HTTP Range Header

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2017-5850. PoCs published by PierreKimSec.

AI-analyzed exploit summary The exploit demonstrates two DoS vulnerabilities in OpenBSD's httpd server: CPU exhaustion via SSL renegotiation and memory exhaustion via malformed HTTP range requests. The provided Perl script automates the memory exhaustion attack by repeatedly requesting a large file with a custom range header.

Description

httpd in OpenBSD allows remote attackers to cause a denial of service (memory consumption) via a series of requests for a large file using an HTTP Range header.

Exploits (1)

exploitdb WORKING POC
by PierreKimSec · textdosopenbsd
https://www.exploit-db.com/exploits/41278

The exploit demonstrates two DoS vulnerabilities in OpenBSD's httpd server: CPU exhaustion via SSL renegotiation and memory exhaustion via malformed HTTP range requests. The provided Perl script automates the memory exhaustion attack by repeatedly requesting a large file with a custom range header.

Classification
Working Poc 100%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: OpenBSD httpd (up to version 6.0)
No auth needed
Prerequisites: Network access to the target server · A large file served by the target HTTP server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (11)

Core 11
Core References
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2017/02/02/6
Exploit, Patch, Third Party Advisory x_refsource_misc
https://pierrekim.github.io/blog/2017-02-07-openbsd-httpd-CVE-2017-5850.html
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/95997
Exploit, Patch, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/41278/
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1037758
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://marc.info/?l=openbsd-cvs&m=148587359420912&w=2
Third Party Advisory, VDB Entry mailing-list x_refsource_fulldisc
http://seclists.org/fulldisclosure/2017/Feb/15
Exploit, Third Party Advisory, VDB Entry x_refsource_misc
http://packetstormsecurity.com/files/140944/OpenBSD-HTTP-Server-6.0-Denial-Of-Service.html

Scores

CVSS v3 7.5
EPSS 0.1720
EPSS Percentile 96.7%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-770
Status published
Products (1)
openbsd/openbsd 6.0
Published Mar 27, 2017
Tracked Since Feb 18, 2026