How severe is CVE-2009-4881?

CVE-2009-4881 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-4881 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4881?

CVE-2009-4881 primarily affects Gnu Glibc. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4881?

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

When was CVE-2009-4881 published?

CVE-2009-4881 was published on 2010-06-01 and last updated on 2026-06-16.

CVE-2009-4881

CVE-2009-4881 is a medium-severity vulnerability in Gnu Glibc with a CVSS 2.0 base score of 5.0. 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 5.0)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Gnu Glibc
Published: 2010-06-01
Last modified: 2026-06-16

Description

Integer overflow in the __vstrfmon_l function in stdlib/strfmon_l.c in the strfmon implementation in the GNU C Library (aka glibc or libc6) before 2.10.1 allows context-dependent attackers to cause a denial of service (application crash) via a crafted format string, as demonstrated by the %99999999999999999999n string, a related issue to CVE-2008-1391.

Frequently asked questions

What is CVE-2009-4881?: Integer overflow in the __vstrfmon_l function in stdlib/strfmon_l.c in the strfmon implementation in the GNU C Library (aka glibc or libc6) before 2.10.1 allows context-dependent attackers to cause a denial of service (application crash) via a crafted format string, as demonstrated by the %99999999999999999999n string, a related issue to CVE-2008-1391.
How severe is CVE-2009-4881?: CVE-2009-4881 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-4881 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4881?: CVE-2009-4881 primarily affects Gnu Glibc. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4881?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4881 published?: CVE-2009-4881 was published on 2010-06-01 and last updated on 2026-06-16.

References

Affected products (46)

cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.00:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.01:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.02:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.03:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.04:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.05:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.06:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.07:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.08:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:1.09:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.0:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.0.3:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.0.5:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.0.6:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.1:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.1.1.6:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.1.3:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.1.3.10:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.1.9:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.2:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.2.1:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.2.2:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.2.3:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.2.4:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.2.5:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3.3:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3.4:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3.5:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3.6:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.3.10:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:2.4:*:*:*:*:*:*:*

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