CVE-2021-22991

CRITICALCISA KEV

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/31/2021

Last Modified10/27/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorF5

ProductBIG-IP Traffic Management Microkernel

Vulnerability NameF5 BIG-IP Traffic Management Microkernel Buffer Overflow

KEV Date Added2022-01-18

Remediation Due Date2022-02-01

Ransomware UseUnknown

Affected Products

f5:big-ip_access_policy_managerf5:big-ip_advanced_firewall_managerf5:big-ip_advanced_web_application_firewallf5:big-ip_analyticsf5:big-ip_application_acceleration_managerf5:big-ip_application_security_managerf5:big-ip_ddos_hybrid_defenderf5:big-ip_domain_name_systemf5:big-ip_fraud_protection_servicef5:big-ip_global_traffic_managerf5:big-ip_link_controllerf5:big-ip_local_traffic_managerf5:big-ip_policy_enforcement_managerf5:ssl_orchestrator

Weaknesses (CWE)

CWE-119CWE-119

References

https://support.f5.com/csp/article/K56715231(f5sirt@f5.com)

https://support.f5.com/csp/article/K56715231(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22991(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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