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CVE-2018-5743

28
FAUCET Score

CVE-2018-5743 is a denial-of-service vulnerability in multiple versions of BIND, including BIND 9.9.0 through 9.10.8-P1, 9.11.0 through 9.11.6, 9.12.0 through 9.12.4, and 9.14.0, as well as specific Supported Preview Edition and development branch versions. The flaw allows an attacker to bypass intended TCP client connection limits, leading to an uncontrolled increase in simultaneous connections. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a high impact on availability with low attack complexity and no user interaction required. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 11.5.2, <= 11.6.5CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
>= 12.1.0, <= 12.1.4CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
>= 13.0.0, <= 13.1.1CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
>= 14.0.0, <= 14.1.0CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
15.0.0CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_local_traffic_manager:15.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.40%
Probability of exploitation in next 30 days
EPSS Percentile
92.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0640 is in the 88th percentile among its peer group of 51,466 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 (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: bind-32:9.8.2-0.68.rc1.el6_10.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: bind-32:9.9.4-74.el7_6.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.4 Extended Update SupportFixed in: bind-32:9.9.4-51.el7_4.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.5 Extended Update SupportFixed in: bind-32:9.9.4-61.el7_5.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: bind-32:9.11.4-17.P2.el8_0
View patch

Vendor Advisories (1)

redhatCVE-2018-5743Important

bind: Limiting simultaneous TCP clients is ineffective

Apr 24, 2019

References

kb.isc.org / docs/cve-2018-5743
Third Party Advisory
support.f5.com / csp/article/K74009656
synology.com / security/advisory/Synology_SA_19_20