How severe is CVE-2009-0887?

CVE-2009-0887 has a CVSS 2.0 base score of 6.6, rated medium severity.

Is CVE-2009-0887 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0887?

CVE-2009-0887 primarily affects Linux-pam. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0887?

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

When was CVE-2009-0887 published?

CVE-2009-0887 was published on 2009-03-12 and last updated on 2026-06-16.

CVE-2009-0887

CVE-2009-0887 is a medium-severity vulnerability in Linux-pam with a CVSS 2.0 base score of 6.6. 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-189.

Key facts

Severity: Medium (CVSS 2.0 base score 6.6)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Linux-pam
Published: 2009-03-12
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2009-0887?: 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.
How severe is CVE-2009-0887?: CVE-2009-0887 has a CVSS 2.0 base score of 6.6, rated medium severity.
Is CVE-2009-0887 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0887?: CVE-2009-0887 primarily affects Linux-pam. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0887?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0887 published?: CVE-2009-0887 was published on 2009-03-12 and last updated on 2026-06-16.

References

Affected products (20)

cpe:2.3:a:linux-pam:linux-pam:*:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.1.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.2.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.2.1:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.3.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.4.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.5.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.6.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.6.1:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.6.2:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.6.3:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.7.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.7.1:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.8.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.8.1:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.9.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:0.99.10.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:linux-pam:linux-pam:1.0.2:*:*:*:*:*:*:*

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