CVE-2009-4086

Xerver HTTP Server <4.33 - CRLF Injection

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2009-4086. PoCs published by s4squatch.

AI-analyzed exploit summary This exploit demonstrates an HTTP Response Splitting vulnerability in Xerver 4.31 and 4.32. The PoC uses URL-encoded characters to inject malicious HTTP headers and content, potentially leading to cache poisoning or XSS attacks.

Description

CRLF injection vulnerability in Xerver HTTP Server 4.31 and 4.32 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via certain byte sequences at the end of a URL. NOTE: some of these details are obtained from third party information.

Exploits (1)

exploitdb WORKING POC VERIFIED
by s4squatch · textwebappsmultiple
https://www.exploit-db.com/exploits/10170

This exploit demonstrates an HTTP Response Splitting vulnerability in Xerver 4.31 and 4.32. The PoC uses URL-encoded characters to inject malicious HTTP headers and content, potentially leading to cache poisoning or XSS attacks.

Classification
Working Poc 90%
Attack Type
Other
Complexity
Trivial
Reliability
Reliable
Target: Xerver 4.31, 4.32
No auth needed
Prerequisites: Access to the target web server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/36681
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/54356
Exploit vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/37064

Scores

EPSS 0.0476
EPSS Percentile 90.7%

Details

CWE
CWE-20
Status published
Products (2)
javascript/xerver_http_server 4.31
javascript/xerver_http_server 4.32
Published Nov 29, 2009
Tracked Since Feb 18, 2026