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.
CVE-2011-0997
“—” beside the score: it is equal to NVD's CVSS v2 base score.
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — NVD rates that HIGH (NVD's v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 85% exploitation probability in the next 30 days; it does not lift the v2 base. EPSS sets EG Risk's exploitation input. Confidence: LOW.
- High exploitation likelihood — EPSS 85%
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 7.5HIGHlow confidence
- EG Risk
- 68EG Risk 68/100
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%The EG Score, 7.5 of 10.Exploitation85% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 85%
- EPSS %ILE
- 99th
- KEV
- Not listed
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
April 8, 2011
Last Modified
April 29, 2026
References (35)
- MITRE · CVE Programhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761Third Party Advisory
- MITRE · CVE Programhttp://lists.fedoraproject.org/pipermail/package-announce/2011-April/057888.htmlMailing List · Third Party Advisory
- MITRE · CVE Programhttp://lists.fedoraproject.org/pipermail/package-announce/2011-April/058279.htmlMailing List · Third Party Advisory
- MITRE · CVE Programhttp://marc.info/?l=bugtraq&m=133226187115472&w=2Mailing List · Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/44037 (archived copy: the site no longer serves it)Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/44048 (archived copy: the site no longer serves it)Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/44089 (archived copy: the site no longer serves it)Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/44090 (archived copy: the site no longer serves it)Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/44103 (archived copy: the site no longer serves it)Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/44127 (archived copy: the site no longer serves it)Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/44180 (archived copy: the site no longer serves it)Third Party Advisory
- MITRE · CVE Programhttp://security.gentoo.org/glsa/glsa-201301-06.xmlThird Party Advisory
- MITRE · CVE Programhttp://securitytracker.com/id?1025300Third Party Advisory · VDB Entry
- MITRE · CVE Programhttp://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.593345Third Party Advisory
- MITRE · CVE Programhttp://www.debian.org/security/2011/dsa-2216Third Party Advisory
15 of 35 shown · show the other 20
- MITRE · CVE Programhttp://www.debian.org/security/2011/dsa-2217Third Party Advisory
- MITRE · CVE Programhttp://www.kb.cert.org/vuls/id/107886Third Party Advisory · US Government Resource
- MITRE · CVE Programhttp://www.mandriva.com/security/advisories?name=MDVSA-2011:073Third Party Advisory
- MITRE · CVE Programhttp://www.osvdb.org/71493 (archived copy: the site no longer serves it)Broken Link
- MITRE · CVE Programhttp://www.redhat.com/support/errata/RHSA-2011-0428.htmlThird Party Advisory
- MITRE · CVE Programhttp://www.redhat.com/support/errata/RHSA-2011-0840.htmlThird Party Advisory
- MITRE · CVE Programhttp://www.securityfocus.com/bid/47176 (archived copy: the site no longer serves it)Third Party Advisory · VDB Entry
- MITRE · CVE Programhttp://www.ubuntu.com/usn/USN-1108-1Third Party Advisory
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2011/0879Permissions Required
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2011/0886Permissions Required
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2011/0909Permissions Required
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2011/0915Permissions Required
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2011/0926Permissions Required
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2011/0965Permissions Required
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2011/1000Permissions Required
- MITRE · CVE Programhttps://bugzilla.redhat.com/show_bug.cgi?id=689832Issue Tracking · Patch · Third Party Advisory
- MITRE · CVE Programhttps://exchange.xforce.ibmcloud.com/vulnerabilities/66580Third Party Advisory · VDB Entry
- MITRE · CVE Programhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12812Third Party Advisory
- MITRE · CVE Programhttps://www.exploit-db.com/exploits/37623/Third Party Advisory · VDB Entry
- MITRE · CVE Programhttps://www.isc.org/software/dhcp/advisories/cve-2011-0997Patch · Vendor Advisory
Patch Availability(4)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | dhcp3-client (3.1.2-1ubuntu7.2) @ karmic | 2026-05-29 | ubuntu |
| ubuntu | dhcp3-client (3.1.3-2ubuntu6.2) @ maverick | 2026-05-29 | ubuntu |
| redhat | dhcp-7:3.0.1-10.3_EL3 | 2011-05-31 | redhat |
| redhat | dhcp-12:4.1.1-12.P1.el6_0.4 | 2011-04-08 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(5 across 5 ecosystems)
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| isc-dhcp | — |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| isc-dhcp | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| isc-dhcp | — |
| — |
Debian:5.0(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| dhcp3 | 3.1.1-6, 3.1.1-6+lenny2, 3.1.1-6+lenny3, 3.1.1-6+lenny4 |
| — |
Debian:6.0(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| isc-dhcp | 4.1.1-P1-15, 4.1.1-P1-15+squeeze1 |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
All Vendor Advisories
(4)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Data Freshness Timeline
(refreshed 3× in last 7d / 10× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 23 repeat rows among the latest 89 are merged into the row they repeat.
- 2026-10-12 01:44 UTCEG score recompute
- 2026-10-10 19:54 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-10-06 15:10 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-10-01 07:10 UTCOSV refresh
- 2026-09-30 14:58 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-09-29 08:15 UTCEG score recompute
- 2026-09-28 13:44 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-09-24 13:57 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-09-16 13:58 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-09-12 08:23 UTCOSV refresh
- 2026-09-06 13:41 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-08-25 13:43 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-08-24 13:32 UTCOSV refresh
- 2026-08-19 16:58 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-08-08 16:31 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-08-08 08:49 UTCOSV refresh
- 2026-08-05 19:12 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-08-01 04:10 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-26 13:42 UTCEG score recomputeAssessed again: 7.5 HIGH
- 2026-07-23 01:40 UTCOSV refresh
- 2026-07-23 01:04 UTCEG score recompute
- 2026-07-23 00:40 UTCEG score recompute▼ 8.90
- 2026-07-23 00:08 UTCEG score recomputeFirst assessed: 8.9 HIGH
- 2026-07-22 21:47 UTCEG score recompute
Show 41 moreShow fewer
- 2026-07-22 14:03 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-21 15:21 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-18 10:00 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-15 16:54 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-13 22:25 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-13 06:08 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-05 20:59 UTCOSV refresh
- 2026-07-04 06:27 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-07-01 15:02 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-06-28 14:03 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-06-25 13:46 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-06-24 14:02 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-06-23 21:30 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-06-17 08:05 UTCOSV refresh
- 2026-06-16 17:49 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-06-15 17:44 UTCEPSS rescoreEPSS 84% · 99th percentile
- 2026-06-14 23:14 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-13 22:57 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-12 23:08 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-11 13:56 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-10 22:14 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-10 13:17 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-08 14:14 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-07 15:22 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-05 22:44 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-05 06:07 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-02 20:10 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-06-01 13:49 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-31 00:14 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-29 13:40 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-29 08:20 UTCEG score recompute
- 2026-05-29 08:20 UTCVendor advisory
- 2026-05-29 08:20 UTCGHSA enrichmentGHSA-hhcj-97jg-v79c · GitHub severity HIGH
- 2026-05-28 13:42 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-27 13:38 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-26 13:41 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-26 07:16 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-22 17:13 UTCOSV refresh
- 2026-05-20 22:37 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-20 11:21 UTCEPSS rescoreEPSS 74% · 98th percentile
- 2026-05-18 21:29 UTCEPSS rescoreEPSS 74% · 98th percentile
Related CVEs(same product + same CWE)
Same product
10 shownDebian:5.0:dhcp3 · Debian:6.0:isc-dhcp · Debian:11:isc-dhcp
- CVE-2011-2749EG 7.8EPSS p99HIGH
- CVE-2011-2748EG 7.8EPSS p99HIGH
- CVE-2009-1892EG 5.0EPSS p95MEDIUM
- CVE-2015-8605NVD 6.5EG 8.9EPSS p100HIGH
- CVE-2011-0413EG 7.8EPSS p98HIGH
- CVE-2012-3955EG 7.1EPSS p98HIGH
- CVE-2012-3571EG 6.1EPSS p96MEDIUM
- CVE-2011-4539EG 5.0EPSS p97MEDIUM
- CVE-2012-3954EG 3.3EPSS p91LOW
- CVE-2017-3144NVD 7.5EG 8.7EPSS p99HIGH
Frequently asked(4)
What is CVE-2011-0997?
When was CVE-2011-0997 made public?
Is CVE-2011-0997 actively exploited?
How do I remediate CVE-2011-0997?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2011-0997
Is Your Infrastructure Affected by CVE-2011-0997?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.