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TI-2011-03910 Aliases CVE-2011-4539GHSA-4mm2-hqgc-vvw9

dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly…

Priority LOW 39CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Partial
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.

Summary

dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly handle regular expressions in dhcpd.conf, which allows remote attackers to cause a denial of service (daemon crash) via a crafted request packet.

Why it matters now

EPSS 0.15219 96th percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 39

CPEVersionsRoleVendor
cpe:2.3:a:isc:dhcp:4.0:*:*:*:*:*:*:*4.0VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.0:*:*:*:*:*:*:*4.0.0VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.1:-:*:*:*:*:*:*4.0.1VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.1:b1:*:*:*:*:*:*4.0.1 b1VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.1:rc1:*:*:*:*:*:*4.0.1 rc1VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.2:-:*:*:*:*:*:*4.0.2VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.2:b1:*:*:*:*:*:*4.0.2 b1VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.2:b2:*:*:*:*:*:*4.0.2 b2VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.2:b3:*:*:*:*:*:*4.0.2 b3VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.2:rc1:*:*:*:*:*:*4.0.2 rc1VulnerableISC
  • cpe:2.3:a:isc:dhcp:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.0:*:*:*:*:*:*:* Versions 4.0.0 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.1:-:*:*:*:*:*:* Versions 4.0.1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.1:b1:*:*:*:*:*:* Versions 4.0.1 b1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.1:rc1:*:*:*:*:*:* Versions 4.0.1 rc1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.2:-:*:*:*:*:*:* Versions 4.0.2 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.2:b1:*:*:*:*:*:* Versions 4.0.2 b1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.2:b2:*:*:*:*:*:* Versions 4.0.2 b2 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.2:b3:*:*:*:*:*:* Versions 4.0.2 b3 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.2:rc1:*:*:*:*:*:* Versions 4.0.2 rc1 Vulnerable ·ISC
Show 29 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:isc:dhcp:4.0.3:-:*:*:*:*:*:*4.0.3VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.3:b1:*:*:*:*:*:*4.0.3 b1VulnerableISC
cpe:2.3:a:isc:dhcp:4.0.3:rc1:*:*:*:*:*:*4.0.3 rc1VulnerableISC
cpe:2.3:a:isc:dhcp:4.1.1:b3:*:*:*:*:*:*4.1.1 b3VulnerableISC
cpe:2.3:a:isc:dhcp:4.1.1:rc1:*:*:*:*:*:*4.1.1 rc1VulnerableISC
cpe:2.3:a:isc:dhcp:4.1.2:*:*:*:*:*:*:*4.1.2VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.0:-:*:*:*:*:*:*4.2.0VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.0:a1:*:*:*:*:*:*4.2.0 a1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.0:a2:*:*:*:*:*:*4.2.0 a2VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.0:b1:*:*:*:*:*:*4.2.0 b1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.0:b2:*:*:*:*:*:*4.2.0 b2VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.0:p1:*:*:*:*:*:*4.2.0 p1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.0:rc1:*:*:*:*:*:*4.2.0 rc1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.1:-:*:*:*:*:*:*4.2.1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.1:b1:*:*:*:*:*:*4.2.1 b1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.1:rc1:*:*:*:*:*:*4.2.1 rc1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.2:-:*:*:*:*:*:*4.2.2VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.2:b1:*:*:*:*:*:*4.2.2 b1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.2:rc1:*:*:*:*:*:*4.2.2 rc1VulnerableISC
cpe:2.3:a:isc:dhcp:4.2.3:-:*:*:*:*:*:*4.2.3VulnerableISC
cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*4.1-esvVulnerableISC
cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*4.1-esv r1VulnerableISC
cpe:2.3:a:isc:dhcp:4.1-esv:r2:*:*:*:*:*:*4.1-esv r2VulnerableISC
cpe:2.3:a:isc:dhcp:4.1-esv:r3:*:*:*:*:*:*4.1-esv r3VulnerableISC
cpe:2.3:a:isc:dhcp:4.1-esv:r3_b1:*:*:*:*:*:*4.1-esv r3_b1VulnerableISC
cpe:2.3:o:canonical:ubuntu_linux:11.04:*:*:*:*:*:*:*11.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*11.10VulnerableCanonical
cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*6.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*7.0VulnerableDebian
  • cpe:2.3:a:isc:dhcp:4.0.3:-:*:*:*:*:*:* Versions 4.0.3 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.3:b1:*:*:*:*:*:* Versions 4.0.3 b1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.0.3:rc1:*:*:*:*:*:* Versions 4.0.3 rc1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1.1:b3:*:*:*:*:*:* Versions 4.1.1 b3 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1.1:rc1:*:*:*:*:*:* Versions 4.1.1 rc1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1.2:*:*:*:*:*:*:* Versions 4.1.2 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.0:-:*:*:*:*:*:* Versions 4.2.0 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.0:a1:*:*:*:*:*:* Versions 4.2.0 a1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.0:a2:*:*:*:*:*:* Versions 4.2.0 a2 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.0:b1:*:*:*:*:*:* Versions 4.2.0 b1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.0:b2:*:*:*:*:*:* Versions 4.2.0 b2 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.0:p1:*:*:*:*:*:* Versions 4.2.0 p1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.0:rc1:*:*:*:*:*:* Versions 4.2.0 rc1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.1:-:*:*:*:*:*:* Versions 4.2.1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.1:b1:*:*:*:*:*:* Versions 4.2.1 b1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.1:rc1:*:*:*:*:*:* Versions 4.2.1 rc1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.2:-:*:*:*:*:*:* Versions 4.2.2 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.2:b1:*:*:*:*:*:* Versions 4.2.2 b1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.2:rc1:*:*:*:*:*:* Versions 4.2.2 rc1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.2.3:-:*:*:*:*:*:* Versions 4.2.3 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:* Versions 4.1-esv Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:* Versions 4.1-esv r1 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1-esv:r2:*:*:*:*:*:* Versions 4.1-esv r2 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1-esv:r3:*:*:*:*:*:* Versions 4.1-esv r3 Vulnerable ·ISC
  • cpe:2.3:a:isc:dhcp:4.1-esv:r3_b1:*:*:*:*:*:* Versions 4.1-esv r3_b1 Vulnerable ·ISC
  • cpe:2.3:o:canonical:ubuntu_linux:11.04:*:*:*:*:*:*:* Versions 11.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:* Versions 11.10 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian

Remediation

Red Hat 1 advisory

  • RHSA-2011:1819 Released 2011-12-14 · Red Hat rating Moderate
    dhcp security update
    • Red Hat Enterprise Linux Desktop (v. 6) dhclient-12:4.1.1-25.P1.el6_2.1, dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-common-12:4.1.1-25.P1.el6_2.1
    • Red Hat Enterprise Linux Desktop Optional (v. 6) dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-devel-12:4.1.1-25.P1.el6_2.1
    • Red Hat Enterprise Linux HPC Node (v. 6) dhclient-12:4.1.1-25.P1.el6_2.1, dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-common-12:4.1.1-25.P1.el6_2.1
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-devel-12:4.1.1-25.P1.el6_2.1
    • Red Hat Enterprise Linux Server (v. 6) dhclient-12:4.1.1-25.P1.el6_2.1, dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-common-12:4.1.1-25.P1.el6_2.1
    • Red Hat Enterprise Linux Server Optional (v. 6) dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-devel-12:4.1.1-25.P1.el6_2.1, dhcp-devel-12:4.1.1-25.P1.el6_2.1.ppc
    • Red Hat Enterprise Linux Workstation (v. 6) dhclient-12:4.1.1-25.P1.el6_2.1, dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-common-12:4.1.1-25.P1.el6_2.1
    • Red Hat Enterprise Linux Workstation Optional (v. 6) dhcp-12:4.1.1-25.P1.el6_2.1, dhcp-devel-12:4.1.1-25.P1.el6_2.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2011:1819
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2011:1819
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2011:1819
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2011:1819
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2011:1819
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2011:1819
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2011:1819
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2011:1819
Not affected: 2 products
  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2011-4539
  2. 2026-10-03 Alias added: GHSA-4mm2-hqgc-vvw9

References

Advisory 8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences