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.
Conclusion & alert: CVE-2011-0721 is rated Moderate Risk (52/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.42%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
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 | 2025-03-30 | 2.64% | 1.42% | -1.22% |
| 2 | 2025-03-29 | 1.42% | 2.64% | +1.22% |
| 3 | 2025-03-19 | — | 1.42% | — |
Full EPSS history (7 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.4 | 2.0 | MEDIUM |
|
10.0 | 4.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2011-0721 not yet assigned priority: Debian including 1 source packages (shadow), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2011-0721 |
gentoo
|
high | CVE-2011-0721: 1 GLSA(s) (201412-09), 25 atom(s) (app-admin/syslog-ng, app-misc/ca-certificates, …); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-0721 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2011-0721 |
ubuntu
|
medium | CVE-2011-0721 medium priority: Ubuntu including 1 source packages (shadow), 6 status rows across 6 suites (dapper, hardy, karmic, lucid, maverick, upstream): released 4, not-affected 2. | https://ubuntu.com/security/CVE-2011-0721 |