Vulnerability Report

CVE-2011-0721

Title: Debian Shadow Improper Input Validation

Input Validation Error

Proof Of Concept

No public PoC currently indexed for CVE-2011-0721.

CWE Category CWE-20

Published Date Feb 19, 2011

Modified Date Jun 16, 2026

Exploit Status Not Found

Score 6.4 CVSS v2.0

Exploit Probability (EPSS)

2.31%

Vulnerability Summary

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.

Impacted Vendors

debian 1

shadow_project 1

blade-group 1

Reference Links

http://osvdb.org/70895 http://secunia.com/advisories/42505 http://secunia.com/advisories/43345 http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.380014 http://www.debian.org/security/2011/dsa-2164 http://www.securityfocus.com/bid/46426 http://www.ubuntu.com/usn/USN-1065-1 http://www.vupen.com/english/advisories/2011/0396 http://www.vupen.com/english/advisories/2011/0398 http://www.vupen.com/english/advisories/2011/0773 https://exchange.xforce.ibmcloud.com/vulnerabilities/65564 http://osvdb.org/70895 http://secunia.com/advisories/42505 http://secunia.com/advisories/43345 http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.380014 http://www.debian.org/security/2011/dsa-2164 http://www.securityfocus.com/bid/46426 http://www.ubuntu.com/usn/USN-1065-1 http://www.vupen.com/english/advisories/2011/0396 http://www.vupen.com/english/advisories/2011/0398 http://www.vupen.com/english/advisories/2011/0773 https://exchange.xforce.ibmcloud.com/vulnerabilities/65564

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

6.4

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:L/Au:N/C:N/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2011-0721 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 29, 2026 MODIFIED

Vulnerability data updated via NVD.

April 11, 2025 MODIFIED

Vulnerability data or affected products updated.

February 19, 2011 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


                                    AV:N/AC:L/Au:N/C:N/I:P/A:P

Affected Stack

No specific products linked.