Vulnerability CVE-2021-22991
Published: 2021-03-31

Description:
On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, undisclosed requests to a virtual server may be incorrectly handled by the Traffic Management Microkernel (TMM) URI normalization, which may trigger a buffer overflow, resulting in a DoS attack. In certain situations, it may theoretically allow bypass of URL based access control or remote code execution (RCE). Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

See advisories in our WLB2 database:
Topic
Author
Date
High
F5 Big IP TMM uri_normalize_host Information Disclosure / Out-Of-Bounds Write
Google Security ...
13.03.2021

Type:

CWE-120

 (Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'))

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
F5 -> Big-ip access policy manager 
F5 -> Big-ip advanced firewall manager 
F5 -> Big-ip advanced web application firewall 
F5 -> Big-ip analytics 
F5 -> Big-ip application acceleration manager 
F5 -> Big-ip application security manager 
F5 -> Big-ip ddos hybrid defender 
F5 -> Big-ip domain name system 
F5 -> Big-ip fraud protection service 
F5 -> Big-ip global traffic manager 
F5 -> Big-ip link controller 
F5 -> Big-ip local traffic manager 
F5 -> Big-ip policy enforcement manager 
F5 -> Ssl orchestrator 

 References:
https://support.f5.com/csp/article/K56715231
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