CVE-2009-0887

Exp

Integer signedness error in the _pam_StrTok function in libpam/pam_misc.c in Linux-PAM (aka pam) 1.0.3 and earlier, when a configuration file contains non-ASCII usernames, might allow remote attackers to cause a denial of service, and might allow remote authenticated users to obtain login access with a different user's non-ASCII username, via a login attempt.

Published: 2009-03-12 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-0887 is rated Exploit Available (55.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.21%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2009-0887

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2009-0887

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 2025-03-19 0.29% 0.21% -0.08%
2 2025-03-17 0.42% 0.29% -0.13%
3 2023-03-07 — 0.42% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-0887

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.6 2.0 MEDIUM
AV:L/AC:M/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 2.7 10.0 [email protected]

Weakness enumeration for CVE-2009-0887

OS Trackers for CVE-2009-0887

vendor priority summary link
debian low CVE-2009-0887 low priority: Debian including 1 source packages (pam), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2009-0887
gentoo normal CVE-2009-0887: 1 GLSA(s) (200909-01), 1 atom(s) (sys-libs/pam); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-0887
redhat low — https://access.redhat.com/security/cve/CVE-2009-0887
ubuntu low CVE-2009-0887 low priority: Ubuntu including 1 source packages (pam), 10 status rows across 10 suites (dapper, gutsy, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, upstream): ignored 4, not-affected 4, released 2. https://ubuntu.com/security/CVE-2009-0887

Vendor comments (NVD) for CVE-2009-0887

  • Red Hat (2009-03-13T00:00:00)

    Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=CVE-2009-0887 The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw. More information regarding issue severity can be found here: http://www.redhat.com/security/updates/classification/

Affected software / configurations for CVE-2009-0887

Vendor Product Version Raw CPE
linux-pam linux-pam <= 1.0.3 cpe:2.3:a:linux-pam:linux-pam:*:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.1.0 cpe:2.3:a:linux-pam:linux-pam:0.99.1.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.2.0 cpe:2.3:a:linux-pam:linux-pam:0.99.2.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.2.1 cpe:2.3:a:linux-pam:linux-pam:0.99.2.1:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.3.0 cpe:2.3:a:linux-pam:linux-pam:0.99.3.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.4.0 cpe:2.3:a:linux-pam:linux-pam:0.99.4.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.5.0 cpe:2.3:a:linux-pam:linux-pam:0.99.5.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.6.0 cpe:2.3:a:linux-pam:linux-pam:0.99.6.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.6.1 cpe:2.3:a:linux-pam:linux-pam:0.99.6.1:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.6.2 cpe:2.3:a:linux-pam:linux-pam:0.99.6.2:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.6.3 cpe:2.3:a:linux-pam:linux-pam:0.99.6.3:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.7.0 cpe:2.3:a:linux-pam:linux-pam:0.99.7.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.7.1 cpe:2.3:a:linux-pam:linux-pam:0.99.7.1:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.8.0 cpe:2.3:a:linux-pam:linux-pam:0.99.8.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.8.1 cpe:2.3:a:linux-pam:linux-pam:0.99.8.1:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.9.0 cpe:2.3:a:linux-pam:linux-pam:0.99.9.0:*:*:*:*:*:*:*
linux-pam linux-pam 0.99.10.0 cpe:2.3:a:linux-pam:linux-pam:0.99.10.0:*:*:*:*:*:*:*
linux-pam linux-pam 1.0.0 cpe:2.3:a:linux-pam:linux-pam:1.0.0:*:*:*:*:*:*:*
linux-pam linux-pam 1.0.1 cpe:2.3:a:linux-pam:linux-pam:1.0.1:*:*:*:*:*:*:*
linux-pam linux-pam 1.0.2 cpe:2.3:a:linux-pam:linux-pam:1.0.2:*:*:*:*:*:*:*

References for CVE-2009-0887

cvelogic Threat Intelligence