How severe is CVE-2011-0721?

CVE-2011-0721 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2011-0721 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0721?

CVE-2011-0721 affects Debian Shadow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-0721?

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

When was CVE-2011-0721 published?

CVE-2011-0721 was published on 2011-02-19 and last updated on 2026-06-16.

CVE-2011-0721

CVE-2011-0721 is a medium-severity vulnerability in Debian Shadow with a CVSS 2.0 base score of 6.4. 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Debian Shadow
Published: 2011-02-19
Last modified: 2026-06-16

Description

Multiple CRLF injection vulnerabilities in (1) chfn and (2) chsh in shadow 1:4.1.4 allow local users to add new users or groups to /etc/passwd via the GECOS field.

Frequently asked questions

What is CVE-2011-0721?: Multiple CRLF injection vulnerabilities in (1) chfn and (2) chsh in shadow 1:4.1.4 allow local users to add new users or groups to /etc/passwd via the GECOS field.
How severe is CVE-2011-0721?: CVE-2011-0721 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-2011-0721 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0721?: CVE-2011-0721 affects Debian Shadow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-0721?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0721 published?: CVE-2011-0721 was published on 2011-02-19 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:debian:shadow:1\:4.1.4:*:*:*:*:*:*:*

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