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CVE-2012-5166

46
FAUCET Score

CVE-2012-5166 is a denial-of-service vulnerability affecting ISC BIND versions 9.x, 9.8.x, 9.9.x, and specific ESV releases prior to their respective patch levels. Remote attackers can exploit this flaw by sending crafted combinations of resource records, causing the named daemon to hang. This vulnerability carries a high CVSS score of 7.8, indicating a critical impact on availability with low attack complexity and no authentication required. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
9.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.0:*:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.0.0:rc1:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.0.0:rc2:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.0.0:rc3:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.0.0:rc4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
34.20%
Probability of exploitation in next 30 days
EPSS Percentile
98.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.3420 is in the 97th percentile among its peer group of 51,455 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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 (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4 Extended Lifecycle SupportFixed in: bind-20:9.2.4-41.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: bind-30:9.3.6-20.P1.el5_8.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: bind97-32:9.7.0-10.P2.el5_8.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: bind-32:9.8.2-0.10.rc1.el6_3.5
View patch

Vendor Advisories (1)

redhatCVE-2012-5166Important

bind: Specially crafted DNS data can cause a lockup in named

Oct 9, 2012

References

aix.software.ibm.com / aix/efixes/security/bind9_advisory5.asc
lists.apple.com / archives/security-announce/2013/Sep/msg00002.html
lists.fedoraproject.org / pipermail/package-announce/2012-October/090346.html
lists.fedoraproject.org / pipermail/package-announce/2012-October/090491.html
lists.fedoraproject.org / pipermail/package-announce/2012-October/090586.html
lists.opensuse.org / opensuse-security-announce/2012-10/msg00011.html
lists.opensuse.org / opensuse-security-announce/2012-10/msg00013.html
osvdb.org / 86118
rhn.redhat.com / errata/RHSA-2012-1363.html
rhn.redhat.com / errata/RHSA-2012-1364.html
rhn.redhat.com / errata/RHSA-2012-1365.html
blogs.oracle.com / sunsecurity/entry/cve_2012_5166_denial_of
secunia.com / advisories/50903
secunia.com / advisories/50909
secunia.com / advisories/50956
secunia.com / advisories/51054
secunia.com / advisories/51078
secunia.com / advisories/51096
secunia.com / advisories/51106
secunia.com / advisories/51178
h20564.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
kb.isc.org / article/AA-00801
Vendor Advisory
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19706
support.apple.com / kb/HT5880
debian.org / security/2012/dsa-2560
ibm.com / support/docview.wss
ibm.com / support/docview.wss
ibm.com / support/docview.wss
ibm.com / support/docview.wss
ibm.com / support/docview.wss
ibm.com / support/docview.wss
ibm.com / support/docview.wss
isc.org / software/bind/advisories/cve-2012-5166
mandriva.com / security/advisories
oracle.com / technetwork/topics/security/ovmbulletinjul2016-3090546.html
securityfocus.com / bid/55852
slackware.com / security/viewer.php
xerox.com / download/security/security-bulletin/16287-4d6b7b0c81f7b/cert_XRX13-003_v1.0.pdf