CVE-2011-5251

Open redirect vulnerability in forum/login.php in vBulletin 4.1.3 and earlier allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via the url parameter in a lostpw action.

Published: 2012-12-31 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-5251 is rated Low Risk (39.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.24%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-5251

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-05-26 0.40% 0.24% -0.16%
2 2025-03-30 0.46% 0.40% -0.06%
3 2025-03-29 — 0.46% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-5251

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2011-5251

Affected software / configurations for CVE-2011-5251

Vendor Product Version Raw CPE
vbulletin vbulletin <= 4.1.3 cpe:2.3:a:vbulletin:vbulletin:*:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.0 cpe:2.3:a:vbulletin:vbulletin:4.0.0:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.1 cpe:2.3:a:vbulletin:vbulletin:4.0.1:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.2 cpe:2.3:a:vbulletin:vbulletin:4.0.2:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.3 cpe:2.3:a:vbulletin:vbulletin:4.0.3:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.4 cpe:2.3:a:vbulletin:vbulletin:4.0.4:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.5 cpe:2.3:a:vbulletin:vbulletin:4.0.5:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.6 cpe:2.3:a:vbulletin:vbulletin:4.0.6:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.7 cpe:2.3:a:vbulletin:vbulletin:4.0.7:*:*:*:*:*:*:*
vbulletin vbulletin 4.0.8 cpe:2.3:a:vbulletin:vbulletin:4.0.8:*:*:*:*:*:*:*
vbulletin vbulletin 4.1 cpe:2.3:a:vbulletin:vbulletin:4.1:*:*:*:*:*:*:*
vbulletin vbulletin 4.1.1 cpe:2.3:a:vbulletin:vbulletin:4.1.1:*:*:*:*:*:*:*
vbulletin vbulletin 4.1.2 cpe:2.3:a:vbulletin:vbulletin:4.1.2:*:*:*:*:*:*:*

References for CVE-2011-5251

cvelogic Threat Intelligence