Is CVE-2012-3955 being actively exploited?

CVE-2012-3955 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2012-3955?

CVE-2012-3955 has a CVSS 2.0 base score of 7.1 (HIGH).

CVE-2012-3955

HIGH · CVSS 7.1EPSS 21.7%EU EUVD

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.

Key facts

CVSS score: 7.1 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:M/Au:N/C:N/I:N/A:C
EPSS score: 21.7% (98th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2012-3899)
Published: September 14, 2012
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2012-3899 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp
isc / dhcp

References

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)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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