Vulnerability in F5 Big-Ip Access Policy Manager
CVE-2021-23009
On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted. There is no control plane exposure, this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.010 (61.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- 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
Weakness classification (CWE)
References
- support.f5.com/csp/article/K90603426 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-23009?
- CVE-2021-23009 is a high-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2021-05-10.
- How severe is CVE-2021-23009?
- High severity. CVSS v3 base score is 7.5 out of 10.