CVE-2009-4834

EXPLOITED

Zeroboard 4.1 pl7 - Remote Code Execution via Crafted Parameter Name

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2009-4834 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 1 public exploit from researchers including SpeeDr00t.

AI-analyzed exploit summary This exploit targets a preg_replace() vulnerability in Zeroboard 4.1 pl7, allowing remote code execution via crafted HTTP requests. It creates a backdoor PHP shell by exploiting improper input validation in the REMOTE_ADDR parameter.

Description

lib.php in Zeroboard 4.1 pl7 allows remote attackers to execute arbitrary PHP code via a crafted parameter name, possibly related to now_connect.php.

Exploits (1)

exploitdb WORKING POC VERIFIED
by SpeeDr00t · cwebappsphp
https://www.exploit-db.com/exploits/9590

This exploit targets a preg_replace() vulnerability in Zeroboard 4.1 pl7, allowing remote code execution via crafted HTTP requests. It creates a backdoor PHP shell by exploiting improper input validation in the REMOTE_ADDR parameter.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Zeroboard 4.1 pl7
No auth needed
Prerequisites: Network access to vulnerable Zeroboard instance · Zeroboard 4.1 pl7 with unpatched preg_replace() vulnerability
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (3)

Core 3
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/53044
Exploit, Third Party Advisory exploit x_refsource_exploit-db
http://www.exploit-db.com/exploits/9590
Exploit vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/36284

Scores

EPSS 0.0130
EPSS Percentile 80.2%

Details

VulnCheck KEV 2012-04-12
CWE
CWE-94
Status published
Products (1)
xpressengine/zeroboard 4.1 pl7
Published May 04, 2010
Tracked Since Feb 18, 2026