CVEvulnerability

CVE-2021-22991

9.8 CRITICAL Known exploited Published 2021-03-31 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

F5 BIG-IP Traffic Management Microkernel Buffer Overflow — F5 BIG-IP Traffic Management Microkernel

The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability, leading to a bypassing of URL-based access controls.

Added to KEV
2022-01-18
Remediation due
2022-02-01
Ransomware use
Unknown
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-22991
Status
Analyzed
Published
2021-03-31
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
6.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:P
Weaknesses
CWE-119

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.

Affected configurations

• f5 big-ip access policy manager (>= 12.1.0 < 12.1.5.3) • f5 big-ip access policy manager (>= 13.1.0 < 13.1.3.6) • f5 big-ip access policy manager (>= 14.1.0 < 14.1.4) • f5 big-ip access policy manager (>= 15.1.0 < 15.1.2.1) • f5 big-ip access policy manager (>= 16.0.0 < 16.0.1.1) • f5 big-ip advanced firewall manager (>= 12.1.0 < 12.1.5.3) • f5 big-ip advanced firewall manager (>= 13.1.0 < 13.1.3.6) • f5 big-ip advanced firewall manager (>= 14.1.0 < 14.1.4) • f5 big-ip advanced firewall manager (>= 15.1.0 < 15.1.2.1) • f5 big-ip advanced firewall manager (>= 16.0.0 < 16.0.1.1) • f5 big-ip advanced web application firewall (>= 12.1.0 < 12.1.5.3) • f5 big-ip advanced web application firewall (>= 13.1.0 < 13.1.3.6) • f5 big-ip advanced web application firewall (>= 14.1.0 < 14.1.4) • f5 big-ip advanced web application firewall (>= 15.1.0 < 15.1.2.1) • f5 big-ip advanced web application firewall (>= 16.0.0 < 16.0.1.1) • f5 big-ip analytics (>= 12.1.0 < 12.1.5.3) • f5 big-ip analytics (>= 13.1.0 < 13.1.3.6) • f5 big-ip analytics (>= 14.1.0 < 14.1.4) • f5 big-ip analytics (>= 15.1.0 < 15.1.2.1) • f5 big-ip analytics (>= 16.0.0 < 16.0.1.1) • f5 big-ip application acceleration manager (>= 12.1.0 < 12.1.5.3) • f5 big-ip application acceleration manager (>= 13.1.0 < 13.1.3.6) • f5 big-ip application acceleration manager (>= 14.1.0 < 14.1.4) • f5 big-ip application acceleration manager (>= 15.1.0 < 15.1.2.1) • f5 big-ip application acceleration manager (>= 16.0.0 < 16.0.1.1) • f5 big-ip application security manager (>= 12.1.0 < 12.1.5.3) • f5 big-ip application security manager (>= 13.1.0 < 13.1.3.6) • f5 big-ip application security manager (>= 14.1.0 < 14.1.4) • f5 big-ip application security manager (>= 15.1.0 < 15.1.2.1) • f5 big-ip application security manager (>= 16.0.0 < 16.0.1.1) • f5 big-ip ddos hybrid defender (>= 12.1.0 < 12.1.5.3) • f5 big-ip ddos hybrid defender (>= 13.1.0 < 13.1.3.6) • f5 big-ip ddos hybrid defender (>= 14.1.0 < 14.1.4) • f5 big-ip ddos hybrid defender (>= 15.1.0 < 15.1.2.1) • f5 big-ip ddos hybrid defender (>= 16.0.0 < 16.0.1.1) • f5 big-ip domain name system (>= 12.1.0 < 12.1.5.3) • f5 big-ip domain name system (>= 13.1.0 < 13.1.3.6) • f5 big-ip domain name system (>= 14.1.0 < 14.1.4) • f5 big-ip domain name system (>= 15.1.0 < 15.1.2.1) • f5 big-ip domain name system (>= 16.0.0 < 16.0.1.1) • f5 big-ip fraud protection service (>= 12.1.0 < 12.1.5.3) • f5 big-ip fraud protection service (>= 13.1.0 < 13.1.3.6) • f5 big-ip fraud protection service (>= 14.1.0 < 14.1.4) • f5 big-ip fraud protection service (>= 15.1.0 < 15.1.2.1) • f5 big-ip fraud protection service (>= 16.0.0 < 16.0.1.1) • f5 big-ip global traffic manager (>= 12.1.0 < 12.1.5.3) • f5 big-ip global traffic manager (>= 13.1.0 < 13.1.3.6) • f5 big-ip global traffic manager (>= 14.1.0 < 14.1.4) • f5 big-ip global traffic manager (>= 15.1.0 < 15.1.2.1) • f5 big-ip global traffic manager (>= 16.0.0 < 16.0.1.1) • f5 big-ip link controller (>= 12.1.0 < 12.1.5.3) • f5 big-ip link controller (>= 13.1.0 < 13.1.3.6) • f5 big-ip link controller (>= 14.1.0 < 14.1.4) • f5 big-ip link controller (>= 15.1.0 < 15.1.2.1) • f5 big-ip link controller (>= 16.0.0 < 16.0.1.1) • f5 big-ip local traffic manager (>= 12.1.0 < 12.1.5.3) • f5 big-ip local traffic manager (>= 13.1.0 < 13.1.3.6) • f5 big-ip local traffic manager (>= 14.1.0 < 14.1.4) • f5 big-ip local traffic manager (>= 15.1.0 < 15.1.2.1) • f5 big-ip local traffic manager (>= 16.0.0 < 16.0.1.1) … and 10 more

Related

Weakness · CWE (1)

  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer weakness

Referenced by CWE · observed example (1)

  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer weakness

References