CVE-2011-0997

HIGHCVSS v2 · 7.57.5—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has 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 84.3% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Elevated
7.5EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 84%
CISA-KEV: Not listedEPSS PROB: 84%CVSS v2: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5(low)
EG Risk
72(Track)
EG Risk 72/100SSVC: Track

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
Severity75% × 45%
Exploitation84% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
84%
EPSS %ILE
100%
KEV
Not listed

Published

April 8, 2011

Last Modified

April 29, 2026

References (70)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudhcp3-client (3.1.2-1ubuntu7.2) @ karmic2026-05-29ubuntu
ubuntudhcp3-client (3.1.3-2ubuntu6.2) @ maverick2026-05-29ubuntu
redhatdhcp-7:3.0.1-10.3_EL32011-05-31redhat
redhatdhcp-12:4.1.1-12.P1.el6_0.42011-04-08redhat

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)
PackageVulnerable rangeFixed inDependents
isc-dhcp—4.1.1-P1-16.1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
isc-dhcp—4.1.1-P1-16.1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
isc-dhcp—4.1.1-P1-16.1—
Debian:5.0(1)
PackageVulnerable rangeFixed inDependents
dhcp33.1.1-6, 3.1.1-6+lenny2, 3.1.1-6+lenny3, 3.1.1-6+lenny43.1.1-6+lenny5—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
isc-dhcp4.1.1-P1-15, 4.1.1-P1-15+squeeze14.1.1-P1-15+squeeze2—

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 2× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-08-25 13:43 UTCEPSS rescore
  2. 2026-08-24 13:32 UTCOSV refresh
  3. 2026-08-19 16:58 UTCEPSS rescore
  4. 2026-08-08 16:31 UTCEPSS rescore
  5. 2026-08-08 08:49 UTCOSV refresh
  6. 2026-08-05 19:12 UTCEPSS rescore
  7. 2026-08-01 04:10 UTCEPSS rescore
  8. 2026-07-26 13:42 UTCEG score recompute▲ 7.50
  9. 2026-07-23 01:40 UTCOSV refresh
  10. 2026-07-23 01:04 UTCEG score recompute
  11. 2026-07-23 00:40 UTCEG score recompute▼ 8.90
  12. 2026-07-23 00:08 UTCEG score recompute▲ 8.90
  13. 2026-07-22 21:47 UTCEG score recompute
  14. 2026-07-22 14:03 UTCEPSS rescore
  15. 2026-07-21 15:21 UTCEPSS rescore
  16. 2026-07-18 10:00 UTCEPSS rescore
  17. 2026-07-15 16:54 UTCEPSS rescore
  18. 2026-07-15 16:54 UTCEPSS rescore
  19. 2026-07-13 22:25 UTCEPSS rescore
  20. 2026-07-13 06:08 UTCEPSS rescore
  21. 2026-07-05 20:59 UTCOSV refresh
  22. 2026-07-04 06:27 UTCEPSS rescore
  23. 2026-07-01 15:02 UTCEPSS rescore
  24. 2026-07-01 15:02 UTCEPSS rescore
  25. 2026-06-28 14:03 UTCEPSS rescore
Show 52 more
  1. 2026-06-25 13:46 UTCEPSS rescore
  2. 2026-06-24 14:02 UTCEPSS rescore
  3. 2026-06-24 14:02 UTCEPSS rescore
  4. 2026-06-23 21:30 UTCEPSS rescore
  5. 2026-06-23 21:30 UTCEPSS rescore
  6. 2026-06-17 08:05 UTCOSV refresh
  7. 2026-06-16 17:49 UTCEPSS rescore
  8. 2026-06-15 17:44 UTCEPSS rescore
  9. 2026-06-14 23:14 UTCEPSS rescore
  10. 2026-06-14 23:14 UTCEPSS rescore
  11. 2026-06-13 22:57 UTCEPSS rescore
  12. 2026-06-13 22:57 UTCEPSS rescore
  13. 2026-06-12 23:08 UTCEPSS rescore
  14. 2026-06-11 13:56 UTCEPSS rescore
  15. 2026-06-10 22:14 UTCEPSS rescore
  16. 2026-06-10 13:17 UTCEPSS rescore
  17. 2026-06-08 14:14 UTCEPSS rescore
  18. 2026-06-08 14:14 UTCEPSS rescore
  19. 2026-06-07 15:22 UTCEPSS rescore
  20. 2026-06-07 15:22 UTCEPSS rescore
  21. 2026-06-05 22:44 UTCEPSS rescore
  22. 2026-06-05 06:08 UTCEPSS rescore
  23. 2026-06-05 06:07 UTCEPSS rescore
  24. 2026-06-02 20:10 UTCEPSS rescore
  25. 2026-06-02 20:10 UTCEPSS rescore
  26. 2026-06-01 13:49 UTCEPSS rescore
  27. 2026-06-01 13:49 UTCEPSS rescore
  28. 2026-05-31 00:14 UTCEPSS rescore
  29. 2026-05-31 00:14 UTCEPSS rescore
  30. 2026-05-29 13:41 UTCEPSS rescore
  31. 2026-05-29 13:40 UTCEPSS rescore
  32. 2026-05-29 08:20 UTCEG score recompute
  33. 2026-05-29 08:20 UTCVendor advisory
  34. 2026-05-29 08:20 UTCGHSA enrichment
  35. 2026-05-28 13:42 UTCEPSS rescore
  36. 2026-05-28 13:42 UTCEPSS rescore
  37. 2026-05-28 13:42 UTCEPSS rescore
  38. 2026-05-27 13:38 UTCEPSS rescore
  39. 2026-05-27 13:38 UTCEPSS rescore
  40. 2026-05-26 13:41 UTCEPSS rescore
  41. 2026-05-26 13:41 UTCEPSS rescore
  42. 2026-05-26 07:16 UTCEPSS rescore
  43. 2026-05-26 07:16 UTCEPSS rescore
  44. 2026-05-22 17:13 UTCOSV refresh
  45. 2026-05-20 22:37 UTCEPSS rescore
  46. 2026-05-20 22:37 UTCEPSS rescore
  47. 2026-05-20 22:37 UTCEPSS rescore
  48. 2026-05-20 11:21 UTCEPSS rescore
  49. 2026-05-20 11:21 UTCEPSS rescore
  50. 2026-05-20 11:21 UTCEPSS rescore
  51. 2026-05-18 21:29 UTCEPSS rescore
  52. 2026-05-18 21:29 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2011-0997?
CVE-2011-0997 is a high vulnerability published on April 8, 2011. 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…
When was CVE-2011-0997 disclosed?
CVE-2011-0997 was first published in the National Vulnerability Database on April 8, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-0997 actively exploited?
CVE-2011-0997 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84% probability of exploitation in the next 30 days, which ranks it in the top 0.3% of all scored CVEs.
How do I remediate CVE-2011-0997?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-0997, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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