CVE-2011-0997

dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote attackers to execute arbitrary commands via shell metacharacters in a hostname obtained from a DHCP message, as demonstrated by a hostname that is provided to dhclient-script.

Published: 2011-04-08 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-0997 is rated High Risk (69.9/100): CVSS High severity, with high exploitation likelihood (EPSS 84.17%, 100th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +10.67% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-0997

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 2026-06-15 73.50% 84.17% +10.67%
2 2026-02-22 81.40% 73.50% -7.90%
3 2025-10-28 — 81.40% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-0997

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2011-0997

OS Trackers for CVE-2011-0997

vendor priority summary link
debian not yet assigned CVE-2011-0997 not yet assigned priority: Debian including 1 source packages (isc-dhcp), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2011-0997
gentoo normal CVE-2011-0997: 1 GLSA(s) (201301-06), 1 atom(s) (net-misc/dhcp); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-0997
redhat high — https://access.redhat.com/security/cve/CVE-2011-0997
suse high CVE-2011-0997 severity important: SUSE including 65 source package names (dhcp-3.1.3.ESV-0.9.1, dhcp-4.2.3.P2-0.7.2, …), 101 product×package rows across 34 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (34 product lines)): Fixed 101. https://www.suse.com/security/cve/CVE-2011-0997/
ubuntu medium CVE-2011-0997 medium priority: Ubuntu including 2 source packages (dhcp3, isc-dhcp), 12 status rows across 6 suites (dapper, hardy, karmic, lucid, maverick, upstream): released 7, DNE 5. https://ubuntu.com/security/CVE-2011-0997

Affected software / configurations for CVE-2011-0997

Vendor Product Version Raw CPE
isc dhcp 3.0 cpe:2.3:a:isc:dhcp:3.0:*:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:-:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc1:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc10:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc11:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc12:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc13:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc14:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc2:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc5:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc6:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc7:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc8:*:*:*:*:*:*
isc dhcp 3.0.1 cpe:2.3:a:isc:dhcp:3.0.1:rc9:*:*:*:*:*:*
isc dhcp 3.0.2 cpe:2.3:a:isc:dhcp:3.0.2:-:*:*:*:*:*:*
isc dhcp 3.0.2 cpe:2.3:a:isc:dhcp:3.0.2:b1:*:*:*:*:*:*
isc dhcp 3.0.2 cpe:2.3:a:isc:dhcp:3.0.2:rc1:*:*:*:*:*:*
isc dhcp 3.0.2 cpe:2.3:a:isc:dhcp:3.0.2:rc2:*:*:*:*:*:*
isc dhcp 3.0.2 cpe:2.3:a:isc:dhcp:3.0.2:rc3:*:*:*:*:*:*
isc dhcp 3.0.3 cpe:2.3:a:isc:dhcp:3.0.3:-:*:*:*:*:*:*
isc dhcp 3.0.3 cpe:2.3:a:isc:dhcp:3.0.3:b1:*:*:*:*:*:*
isc dhcp 3.0.3 cpe:2.3:a:isc:dhcp:3.0.3:b2:*:*:*:*:*:*
isc dhcp 3.0.3 cpe:2.3:a:isc:dhcp:3.0.3:b3:*:*:*:*:*:*
isc dhcp 3.0.4 cpe:2.3:a:isc:dhcp:3.0.4:-:*:*:*:*:*:*
isc dhcp 3.0.4 cpe:2.3:a:isc:dhcp:3.0.4:b1:*:*:*:*:*:*
isc dhcp 3.0.4 cpe:2.3:a:isc:dhcp:3.0.4:b2:*:*:*:*:*:*
isc dhcp 3.0.4 cpe:2.3:a:isc:dhcp:3.0.4:b3:*:*:*:*:*:*
isc dhcp 3.0.4 cpe:2.3:a:isc:dhcp:3.0.4:rc1:*:*:*:*:*:*
isc dhcp 3.0.5 cpe:2.3:a:isc:dhcp:3.0.5:-:*:*:*:*:*:*
isc dhcp 3.0.5 cpe:2.3:a:isc:dhcp:3.0.5:rc1:*:*:*:*:*:*
isc dhcp 3.0.6 cpe:2.3:a:isc:dhcp:3.0.6:rc1:*:*:*:*:*:*
isc dhcp 3.1-esv cpe:2.3:a:isc:dhcp:3.1-esv:*:*:*:*:*:*:*
isc dhcp 3.1.0 cpe:2.3:a:isc:dhcp:3.1.0:-:*:*:*:*:*:*
isc dhcp 3.1.0 cpe:2.3:a:isc:dhcp:3.1.0:a1:*:*:*:*:*:*
isc dhcp 3.1.0 cpe:2.3:a:isc:dhcp:3.1.0:a2:*:*:*:*:*:*
isc dhcp 3.1.0 cpe:2.3:a:isc:dhcp:3.1.0:a3:*:*:*:*:*:*
isc dhcp 3.1.0 cpe:2.3:a:isc:dhcp:3.1.0:b1:*:*:*:*:*:*
isc dhcp 3.1.0 cpe:2.3:a:isc:dhcp:3.1.0:b2:*:*:*:*:*:*
isc dhcp 3.1.0 cpe:2.3:a:isc:dhcp:3.1.0:rc1:*:*:*:*:*:*
isc dhcp 3.1.1 cpe:2.3:a:isc:dhcp:3.1.1:rc1:*:*:*:*:*:*
isc dhcp 3.1.1 cpe:2.3:a:isc:dhcp:3.1.1:rc2:*:*:*:*:*:*
isc dhcp 3.1.2 cpe:2.3:a:isc:dhcp:3.1.2:-:*:*:*:*:*:*
isc dhcp 3.1.2 cpe:2.3:a:isc:dhcp:3.1.2:b1:*:*:*:*:*:*
isc dhcp 3.1.2 cpe:2.3:a:isc:dhcp:3.1.2:rc1:*:*:*:*:*:*
isc dhcp 3.1.3 cpe:2.3:a:isc:dhcp:3.1.3:-:*:*:*:*:*:*
isc dhcp 3.1.3 cpe:2.3:a:isc:dhcp:3.1.3:b1:*:*:*:*:*:*
isc dhcp 3.1.3 cpe:2.3:a:isc:dhcp:3.1.3:rc1:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:rc1:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:-:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:a1:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:a2:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:b1:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:b2:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:p1:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:rc1:*:*:*:*:*:*
isc dhcp 4.2.1 cpe:2.3:a:isc:dhcp:4.2.1:-:*:*:*:*:*:*
isc dhcp 4.2.1 cpe:2.3:a:isc:dhcp:4.2.1:b1:*:*:*:*:*:*
isc dhcp 4.2.1 cpe:2.3:a:isc:dhcp:4.2.1:rc1:*:*:*:*:*:*
debian debian_linux 5.0 cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
canonical ubuntu_linux 6.06 cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*
canonical ubuntu_linux 8.04 cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 9.10 cpe:2.3:o:canonical:ubuntu_linux:9.10:*:*:*:*:*:*:*
canonical ubuntu_linux 10.04 cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 10.10 cpe:2.3:o:canonical:ubuntu_linux:10.10:*:*:*:*:*:*:*

References for CVE-2011-0997

URL Tags
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761 Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/057888.html Mailing List Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058279.html Mailing List Third Party Advisory
http://marc.info/?l=bugtraq&m=133226187115472&w=2 Mailing List Third Party Advisory
http://secunia.com/advisories/44037 Third Party Advisory
http://secunia.com/advisories/44048 Third Party Advisory
http://secunia.com/advisories/44089 Third Party Advisory
http://secunia.com/advisories/44090 Third Party Advisory
http://secunia.com/advisories/44103 Third Party Advisory
http://secunia.com/advisories/44127 Third Party Advisory
http://secunia.com/advisories/44180 Third Party Advisory
http://security.gentoo.org/glsa/glsa-201301-06.xml Third Party Advisory
http://securitytracker.com/id?1025300 Third Party Advisory VDB Entry
http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.593345 Third Party Advisory
http://www.debian.org/security/2011/dsa-2216 Third Party Advisory
http://www.debian.org/security/2011/dsa-2217 Third Party Advisory
http://www.kb.cert.org/vuls/id/107886 Third Party Advisory US Government Resource
http://www.mandriva.com/security/advisories?name=MDVSA-2011:073 Third Party Advisory
http://www.osvdb.org/71493 Broken Link
http://www.redhat.com/support/errata/RHSA-2011-0428.html Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2011-0840.html Third Party Advisory
http://www.securityfocus.com/bid/47176 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-1108-1 Third Party Advisory
http://www.vupen.com/english/advisories/2011/0879 Permissions Required
http://www.vupen.com/english/advisories/2011/0886 Permissions Required
http://www.vupen.com/english/advisories/2011/0909 Permissions Required
http://www.vupen.com/english/advisories/2011/0915 Permissions Required
http://www.vupen.com/english/advisories/2011/0926 Permissions Required
http://www.vupen.com/english/advisories/2011/0965 Permissions Required
http://www.vupen.com/english/advisories/2011/1000 Permissions Required
https://bugzilla.redhat.com/show_bug.cgi?id=689832 Issue Tracking Patch Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/66580 Third Party Advisory VDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12812 Third Party Advisory
https://www.exploit-db.com/exploits/37623/ Third Party Advisory VDB Entry
https://www.isc.org/software/dhcp/advisories/cve-2011-0997 Patch Vendor Advisory
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