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CVE-2015-4620

37
FAUCET Score

CVE-2015-4620 describes a denial-of-service vulnerability affecting ISC BIND versions 9.7.x through 9.9.x before 9.9.7-P1 and 9.10.x before 9.10.2-P2, specifically when configured as a recursive resolver with DNSSEC validation. An unauthenticated remote attacker can trigger an assertion failure and daemon exit by querying a specially crafted zone, leading to a complete service outage. This vulnerability has a high severity CVSS score of 7.8, indicating a critical impact on availability with low attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
9.7.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.7.0:*:*:*:*:*:*:*
9.7.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.7.0:b1:*:*:*:*:*:*
9.7.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.7.0:p1:*:*:*:*:*:*
9.7.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.7.0:p2:*:*:*:*:*:*
9.7.0CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.7.0:rc1:*:*:*:*:*:*

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
37.87%
Probability of exploitation in next 30 days
EPSS Percentile
98.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.3787 is in the 97th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

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 (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: bind-32:9.8.2-0.37.rc1.el6_7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: bind-32:9.9.4-18.el7_1.2
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: bind97

Vendor Advisories (1)

redhatCVE-2015-4620Important

bind: abort DoS caused by uninitialized value use in isselfsigned()

Jul 7, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-July/162040.html
lists.fedoraproject.org / pipermail/package-announce/2015-July/162286.html
lists.opensuse.org / opensuse-security-announce/2015-07/msg00013.html
lists.opensuse.org / opensuse-security-announce/2015-07/msg00050.html
lists.opensuse.org / opensuse-updates/2015-07/msg00038.html
marc.info
rhn.redhat.com / errata/RHSA-2015-1443.html
rhn.redhat.com / errata/RHSA-2015-1471.html
kb.isc.org / article/AA-01267
Vendor Advisory
kb.isc.org / article/AA-01305
kb.isc.org / article/AA-01306
kb.isc.org / article/AA-01307
kb.isc.org / article/AA-01438
kb.juniper.net / JSA10783
kc.mcafee.com / corporate/index
security.gentoo.org / glsa/201510-01
security.netapp.com / advisory/ntap-20190903-0003
debian.org / security/2015/dsa-3304
securityfocus.com / bid/75588
securitytracker.com / id/1032799
ubuntu.com / usn/USN-2669-1