Denial of service in F5 BIG-IP APM OCSP



Published: 2021-08-30
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23047
CWE-ID CWE-401
Exploitation vector Network
Public exploit N/A
Vulnerable software
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BIG-IP APM
Hardware solutions / Security hardware applicances

Vendor F5 Networks

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Memory leak

EUVDB-ID: #VU56157

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 - Missing release of memory after effective lifetime

Exploit availability: No

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

External links

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


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.



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