Skip to content
Fencer Intel
medium 6.1

CVE-2012-3571 json

ISC DHCP 4.1.2 through 4.2.4 and 4.1-ESV before 4.1-ESV-R6 allows remote attackers to cause a denial of service (infinite loop and CPU cons…

published 2012-07-25 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-3518

cvss
6.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.0%
EPSS 13.0% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

ISC DHCP 4.1.2 through 4.2.4 and 4.1-ESV before 4.1-ESV-R6 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a malformed client identifier.

Patch / fix

  • isc-dhcp Debian 13, Debian 12 4.2.4-2

debian advisories DEBIAN-CVE-2012-3571

  • dhcp RHEL 6 12:4.1.1-31.P1.el6_3.1
  • dhclient RHEL 6 12:4.1.1-31.P1.el6_3.1
  • dhcp-common RHEL 6 12:4.1.1-31.P1.el6_3.1
  • dhcp RHEL 5 12:3.0.5-31.el5_8.1
  • dhclient RHEL 5 12:3.0.5-31.el5_8.1
  • libdhcp4client RHEL 5 12:3.0.5-31.el5_8.1

red hat advisories RHSA-2012:1141RHSA-2012:1140

  • dhcp openSUSE Tumbleweed 4.3.3.P1-3.1

opensuse advisories openSUSE-SU-2024:10358-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-3571 updated cvss 3.3

dhcp: DoS due to error in handling malformed client identifiers

  • Red Hat Enterprise Linux (v. 5 server) dhcp 3.0.5-31.el5_8.1, dhclient 3.0.5-31.el5_8.1, libdhcp4client 3.0.5-31.el5_8.1 Red Hat Enterprise Linux Desktop (v. 5 client) dhcp 3.0.5-31.el5_8.1, dhclient 3.0.5-31.el5_8.1, libdhcp4client 3.0.5-31.el5_8.1
    fixed: vendor fix RHSA-2012:1140
  • Red Hat Enterprise Linux Desktop (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1 Red Hat Enterprise Linux Desktop Optional (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1 Red Hat Enterprise Linux HPC Node (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1 Red Hat Enterprise Linux HPC Node Optional (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1 Red Hat Enterprise Linux Server (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1 Red Hat Enterprise Linux Server Optional (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1 Red Hat Enterprise Linux Workstation Optional (v. 6) dhcp 4.1.1-31.P1.el6_3.1, dhclient 4.1.1-31.P1.el6_3.1, dhcp-common 4.1.1-31.P1.el6_3.1
    fixed: vendor fix RHSA-2012:1141
  • Red Hat RHEL Desktop Workstation (v. 5 client) dhcp 3.0.5-31.el5_8.1, dhclient 3.0.5-31.el5_8.1, libdhcp4client 3.0.5-31.el5_8.1
    fixed: vendor fix RHSA-2012:1140

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-37538)
  2. Published

Exploit prediction

12.98% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-37538 ISC DHCP 4.x - Multiple Denial of Service Vulnerabilities dos, 2012-07-25

CVSS scores

assigned by version score vector
NVD 2.0 6.1 AV:A/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.