Denial of service ISC BIND



| Updated: 2021-11-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-25219
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 ISC BIND
Server applications / DNS servers

Vendor ISC

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU57752

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-25219

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to BIND does not properly control consumption of internal resources when processing lame cache. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ISC BIND: 9.3 - 9.17.18

CPE2.3 External links

https://kb.isc.org/v1/docs/cve-2021-25219


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.



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