SB2021021117 - Denial of service when processing WebSocket requests in BIG-IP Advanced WAF and ASM
Published: February 11, 2021
Security Bulletin ID
SB2021021117
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2021-22976)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources when processing WebSocket requests with JSON payloads. A remote attacker can send a huge amount of parameters in a request, trigger resource exhaustion and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.