Denial of service in ISC BIND

Published: 2018-08-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-5740
Exploitation vector Network
Public exploit N/A
Vulnerable software
Server applications / DNS servers

Vendor ISC

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Assertion failure

EUVDB-ID: #VU14291

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5740

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No


The vulnerability allows an attacker to perform denial of service (DoS) attack.

The vulnerability exists due to INSIST assertion failure in name.c when processing recursive queries. A remote attacker can trigger denial of service conditions if the affected server is configured with enabled "deny-answer-aliases" feature.


Update to version 9.9.13-P1, 9.10.8-P1, 9.11.3-S3, 9.11.4-P1 or 9.12.2-P1

Vulnerable software versions

ISC BIND: 9.7.0 - 9.13.2

External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.