Vulnerability identifier: #VU56157

Vulnerability 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-2021-23047

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP APM
Hardware solutions / Security hardware applicances

Vendor: F5 Networks

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

The vulnerability exists due memory leak in the Online Certificate Status Protocol (OCSP) verification of a certificate that contains Authority Information Access (AIA). A remote attacker can send a specially crafted OCSP AIA request and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIG-IP APM: 11.6.1 - 16.0.1

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External links
http://support.f5.com/csp/article/K79428827

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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.