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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (16.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Vbulletin — versions 3.8.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vbulletin.com (Product)
- github.com/oiyl/CVE-2025-46171 (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.