CVE-2009-1803

FreePBX 2.5.1, and other 2.4.x, 2.5.x, and pre-release 2.6.x versions, generates different error messages for a failed login attempt depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.

Published: 2009-05-28 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-1803 is rated Moderate Risk (43.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.22%). Review affected assets and schedule remediation.

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-2009-1803

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 2026-06-15 0.32% 1.22% +0.90%
2 2025-03-30 0.38% 0.32% -0.06%
3 2025-03-29 — 0.38% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-1803

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2009-1803

Affected software / configurations for CVE-2009-1803

Vendor Product Version Raw CPE
freepbx freepbx 2.4 cpe:2.3:a:freepbx:freepbx:2.4:*:*:*:*:*:*:*
freepbx freepbx 2.4.0_beta1 cpe:2.3:a:freepbx:freepbx:2.4.0_beta1:*:*:*:*:*:*:*
freepbx freepbx 2.4.0_beta2 cpe:2.3:a:freepbx:freepbx:2.4.0_beta2:*:*:*:*:*:*:*
freepbx freepbx 2.4.1 cpe:2.3:a:freepbx:freepbx:2.4.1:*:*:*:*:*:*:*
freepbx freepbx 2.5 cpe:2.3:a:freepbx:freepbx:2.5:*:*:*:*:*:*:*
freepbx freepbx 2.5.0_beta1 cpe:2.3:a:freepbx:freepbx:2.5.0_beta1:*:*:*:*:*:*:*
freepbx freepbx 2.5.0rc2 cpe:2.3:a:freepbx:freepbx:2.5.0rc2:*:*:*:*:*:*:*
freepbx freepbx 2.5.0rc3 cpe:2.3:a:freepbx:freepbx:2.5.0rc3:*:*:*:*:*:*:*
freepbx freepbx 2.5.1 cpe:2.3:a:freepbx:freepbx:2.5.1:*:*:*:*:*:*:*
freepbx freepbx 2.5.2 cpe:2.3:a:freepbx:freepbx:2.5.2:*:*:*:*:*:*:*
sangoma freepbx 2.4.0 cpe:2.3:a:sangoma:freepbx:2.4.0:*:*:*:*:*:*:*
sangoma freepbx 2.5.0 cpe:2.3:a:sangoma:freepbx:2.5.0:*:*:*:*:*:*:*

References for CVE-2009-1803

cvelogic Threat Intelligence