CVE-2011-0438

nslcd/pam.c in the nss-pam-ldapd 0.8.0 PAM module returns a success code when a user is not found in LDAP, which allows remote attackers to bypass authentication.

Published: 2011-03-15 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-0438 is rated Moderate Risk (48.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.44%). 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-2011-0438

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 2025-03-30 0.46% 0.44% -0.02%
2 2025-03-29 0.44% 0.46% +0.02%
3 2025-03-17 — 0.44% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-0438

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P 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:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2011-0438

OS Trackers for CVE-2011-0438

vendor priority summary link
debian unimportant CVE-2011-0438 unimportant priority: Debian including 1 source packages (nss-pam-ldapd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-0438
ubuntu high CVE-2011-0438 high priority: Ubuntu including 1 source packages (nss-pam-ldapd), 6 status rows across 6 suites (dapper, hardy, karmic, lucid, maverick, upstream): DNE 3, not-affected 2, released 1. https://ubuntu.com/security/CVE-2011-0438

Affected software / configurations for CVE-2011-0438

Vendor Product Version Raw CPE
arthurdejong nss-pam-ldapd 0.8.0 cpe:2.3:a:arthurdejong:nss-pam-ldapd:0.8.0:*:*:*:*:*:*:*

References for CVE-2011-0438

cvelogic Threat Intelligence