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Fencer Intel
high 7.1

CVE-2012-3955 in the critical feed json

ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service (daemon crash) in opportuni…

published 2012-09-14 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-3899

cvss
7.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
21.7%
EPSS 21.7% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service (daemon crash) in opportunistic circumstances by establishing an IPv6 lease in an environment where the lease expiration time is later reduced.

Patch / fix

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

debian advisories DEBIAN-CVE-2012-3955

  • dhcp RHEL 6 12:4.1.1-34.P1.el6
  • dhclient RHEL 6 12:4.1.1-34.P1.el6
  • dhcp-common RHEL 6 12:4.1.1-34.P1.el6

red hat advisories RHSA-2013:0504

  • 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-2012-3955 updated cvss 2.9

dhcp: reduced expiration time of an IPv6 lease may cause dhcpd to crash

  • Red Hat Enterprise Linux Desktop (v. 6) dhcp 4.1.1-34.P1.el6, dhclient 4.1.1-34.P1.el6, dhcp-common 4.1.1-34.P1.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) dhcp 4.1.1-34.P1.el6 Red Hat Enterprise Linux HPC Node (v. 6) dhcp 4.1.1-34.P1.el6, dhclient 4.1.1-34.P1.el6, dhcp-common 4.1.1-34.P1.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) dhcp 4.1.1-34.P1.el6 Red Hat Enterprise Linux Server (v. 6) dhcp 4.1.1-34.P1.el6, dhclient 4.1.1-34.P1.el6, dhcp-common 4.1.1-34.P1.el6 Red Hat Enterprise Linux Server Optional (v. 6) dhcp 4.1.1-34.P1.el6
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) dhcp 4.1.1-34.P1.el6, dhclient 4.1.1-34.P1.el6, dhcp-common 4.1.1-34.P1.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) dhcp 4.1.1-34.P1.el6
    fixed: vendor fix RHSA-2013:0504
  • Red Hat Enterprise Linux 5 dhcp
    not affected: vulnerable code not present

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

Exploit prediction

21.65% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C

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.