CVE-2025-46171: vbulletin DoS — Exploit

Description

vBulletin 3.8.7 is vulnerable to a denial-of-service condition via the misc.php?do=buddylist endpoint. If an authenticated user has a sufficiently large buddy list, processing the list can consume excessive memory, exhausting system resources and crashing the forum.

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CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
vbulletin	vbulletin	All

References

Exploits

https://github.com/oiyl/CVE-2025-46171

Other References

http://vbulletin.com

Frequently Asked Questions

What is CVE-2025-46171? +

vBulletin 3.8.7 is vulnerable to a denial-of-service condition via the misc.php?do=buddylist endpoint. If an authenticated user has a sufficiently large buddy list, processing the list can consume excessive memory, exhausting system resources and crashing the forum. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-46171? +

CVE-2025-46171 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-46171? +

CVE-2025-46171 affects products from vbulletin, specifically: vbulletin. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-46171? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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