Is CVE-2025-46171 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 0%.

What products does CVE-2025-46171 affect?

Tracked products affected include vBulletin. Check the version you run to see whether it is affected.

How do I fix CVE-2025-46171?

Apply the vendor fix in your normal patch cycle. Upgrade affected products to a fixed version.

CVE-2025-46171

Q: What is CVE-2025-46171?

CVE-2025-46171 is a medium-severity software vulnerability (Uncontrolled resource consumption) with a CVSS score of 5.4. 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 resourc

MEDIUM severity · CVSS 5.4 · Uncontrolled resource consumption

5.4CVSS MEDIUM

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionRequired

Confidentiality impactLow

Integrity impactLow

Availability impactNone

Exploit probability (EPSS)0%

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

Affected products we track (1)

vBulletin

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

NVD record
https://github.com/oiyl/CVE-2025-46171Advisory
http://vbulletin.com