How severe is CVE-2025-46171?

CVE-2025-46171 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-46171 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-46171?

CVE-2025-46171 affects Vbulletin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-46171?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-46171 have an EU (EUVD) identifier?

Yes. CVE-2025-46171 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22462.

When was CVE-2025-46171 published?

CVE-2025-46171 was published on 2025-07-23 and last updated on 2026-07-05.

CVE-2025-46171

CVE-2025-46171 is a medium-severity vulnerability in Vbulletin with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22462
Weakness: CWE-400
Affected product: Vbulletin
Published: 2025-07-23
Last modified: 2026-07-05

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.

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.
How severe is CVE-2025-46171?: CVE-2025-46171 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-46171 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-46171?: CVE-2025-46171 affects Vbulletin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-46171?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-46171 have an EU (EUVD) identifier?: Yes. CVE-2025-46171 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22462.
When was CVE-2025-46171 published?: CVE-2025-46171 was published on 2025-07-23 and last updated on 2026-07-05.

References

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

EU advisories (EUVD)

http://vbulletin.com

Affected products (1)

cpe:2.3:a:vbulletin:vbulletin:3.8.7:*:*:*:*:*:*:*

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