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CVE-2012-3955

34
FAUCET Score

CVE-2012-3955 describes a denial-of-service vulnerability affecting ISC DHCP versions 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2. Remote attackers can crash the DHCP daemon by establishing an IPv6 lease and then reducing its expiration time. Rated with a CVSS score of 7.1 (High), this vulnerability has a network attack vector, medium attack complexity, and results in a complete loss of availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.1-esvCPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*
4.1-esvCPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*
4.1-esvCPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.1-esv:r2:*:*:*:*:*:*
4.1-esvCPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.1-esv:r3:*:*:*:*:*:*
4.1-esvCPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.1-esv:r3_b1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.1HIGH

AV:N/AC:M/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
21.65%
Probability of exploitation in next 30 days
EPSS Percentile
97.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2165 is in the 88th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: dhcp-12:4.1.1-34.P1.el6
View patch

Vendor Advisories (1)

redhatCVE-2012-3955Low

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

Sep 12, 2012

References

lists.fedoraproject.org / pipermail/package-announce/2012-October/088882.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2012-September/086992.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2012-September/088220.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2012-09/msg00088.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2012-09/msg00103.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2012-09/msg00105.html
Mailing ListThird Party Advisory
rhn.redhat.com / errata/RHSA-2013-0504.html
Third Party Advisory
blogs.oracle.com / sunsecurity/entry/cve_2012_3955_denial_of
Third Party Advisory
secunia.com / advisories/51318
Third Party Advisory
security.gentoo.org / glsa/glsa-201301-06.xml
Third Party Advisory
kb.isc.org / article/AA-00779
Vendor Advisory
debian.org / security/2012/dsa-2551
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
securityfocus.com / bid/55530
Third Party AdvisoryVDB Entry
securitytracker.com / id
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-1571-1
Third Party Advisory