What is CVE-2025-46171?

CVE-2025-46171 is a medium-severity vulnerability in Vbulletin, classified under Uncontrolled Resource Consumption. CVSS score: 5.4/10. Published 2025-07-23.

How severe is CVE-2025-46171?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2025-46171 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Vbulletin

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.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.002 (15.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Vbulletin — versions 3.8.7
N/a — versions n/a

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

Public proof-of-concept exploits

References

cve@mitre.org (Product)
cve@mitre.org (Exploit, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2025-46171?: CVE-2025-46171 is a medium-severity vulnerability in Vbulletin, classified under Uncontrolled Resource Consumption. CVSS score: 5.4/10. Published 2025-07-23.
How severe is CVE-2025-46171?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2025-46171 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.