CVE-2012-3955

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.

Published: 2012-09-14 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-3955 is rated High Risk (66.7/100): CVSS High severity, with high exploitation likelihood (EPSS 21.65%, 97th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.21% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-3955

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 17.44% 21.65% +4.21%
2 2026-05-24 15.52% 17.44% +1.92%
3 2026-05-16 — 15.52% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-3955

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 2.0 HIGH
AV:N/AC:M/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 6.9 [email protected]

Weakness enumeration for CVE-2012-3955

OS Trackers for CVE-2012-3955

vendor priority summary link
debian not yet assigned CVE-2012-3955 not yet assigned priority: Debian including 1 source packages (isc-dhcp), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2012-3955
gentoo normal CVE-2012-3955: 1 GLSA(s) (201301-06), 1 atom(s) (net-misc/dhcp); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-3955
redhat low — https://access.redhat.com/security/cve/CVE-2012-3955
suse high CVE-2012-3955 severity important: SUSE including 57 source package names (dhcp-4.2.4.P2-0.16.15, dhcp-4.2.4.P2-0.22.1, …), 95 product×package rows across 36 product lines (SUSE Linux Enterprise Desktop 11 SP2, SUSE Linux Enterprise Desktop 12, … (36 product lines)): Fixed 95. https://www.suse.com/security/cve/CVE-2012-3955/
ubuntu medium CVE-2012-3955 medium priority: Ubuntu including 2 source packages (dhcp3, isc-dhcp), 12 status rows across 6 suites (hardy, lucid, natty, oneiric, precise, upstream): DNE 5, released 4, not-affected 3. https://ubuntu.com/security/CVE-2012-3955

Affected software / configurations for CVE-2012-3955

Vendor Product Version Raw CPE
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r2:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r3:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r3_b1:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r4:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r5:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r5_b1:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc1:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc2:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:r6:*:*:*:*:*:*
isc dhcp 4.1-esv cpe:2.3:a:isc:dhcp:4.1-esv:rc1:*:*:*:*:*:*
isc dhcp 4.1.0 cpe:2.3:a:isc:dhcp:4.1.0:-:*:*:*:*:*:*
isc dhcp 4.1.0 cpe:2.3:a:isc:dhcp:4.1.0:a1:*:*:*:*:*:*
isc dhcp 4.1.0 cpe:2.3:a:isc:dhcp:4.1.0:a2:*:*:*:*:*:*
isc dhcp 4.1.0 cpe:2.3:a:isc:dhcp:4.1.0:b1:*:*:*:*:*:*
isc dhcp 4.1.1 cpe:2.3:a:isc:dhcp:4.1.1:-:*:*:*:*:*:*
isc dhcp 4.1.1 cpe:2.3:a:isc:dhcp:4.1.1:b1:*:*:*:*:*:*
isc dhcp 4.1.1 cpe:2.3:a:isc:dhcp:4.1.1:b2:*:*:*:*:*:*
isc dhcp 4.1.1 cpe:2.3:a:isc:dhcp:4.1.1:b3:*:*:*:*:*:*
isc dhcp 4.1.1 cpe:2.3:a:isc:dhcp:4.1.1:rc1:*:*:*:*:*:*
isc dhcp 4.1.2 cpe:2.3:a:isc:dhcp:4.1.2:-:*:*:*:*:*:*
isc dhcp 4.1.2 cpe:2.3:a:isc:dhcp:4.1.2:b1:*:*:*:*:*:*
isc dhcp 4.1.2 cpe:2.3:a:isc:dhcp:4.1.2:p1:*:*:*:*:*:*
isc dhcp 4.1.2 cpe:2.3:a:isc:dhcp:4.1.2:rc1:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
canonical ubuntu_linux 10.04 cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 11.04 cpe:2.3:o:canonical:ubuntu_linux:11.04:*:*:*:*:*:*:*
canonical ubuntu_linux 11.10 cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*

References for CVE-2012-3955

URL Tags
http://lists.fedoraproject.org/pipermail/package-announce/2012-October/088882.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2012-September/086992.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2012-September/088220.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2012-09/msg00088.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2012-09/msg00103.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2012-09/msg00105.html Mailing List Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2013-0504.html Third Party Advisory
http://secunia.com/advisories/51318 Third Party Advisory
http://security.gentoo.org/glsa/glsa-201301-06.xml Third Party Advisory
http://www.debian.org/security/2012/dsa-2551 Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2012:153 Third Party Advisory
http://www.securityfocus.com/bid/55530 Third Party Advisory VDB Entry
http://www.securitytracker.com/id?1027528 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-1571-1 Third Party Advisory
https://blogs.oracle.com/sunsecurity/entry/cve_2012_3955_denial_of Third Party Advisory
https://kb.isc.org/article/AA-00779 Vendor Advisory
cvelogic Threat Intelligence