Denial of service in F5 BIG-IP BIND

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

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

BIG-IP: 11.6.1 - 16.1.2

BIG-IQ Centralized Management: 8.0.0 - 8.1.0

CPE2.3

• cpe:2.3:h:f5_networks:big-ip:11.6.1:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.1_HF1:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.2:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.2_HF1:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.3:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.3.1:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.3.2:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.4:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.5:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:11.6.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:f5_networks:big-iq:8.0.0:*:*:*:*:*:*:*

External links

https://support.f5.com/csp/article/K77326807

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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