CVE-2021-22991
F5 — F5 BIG-IP Traffic Management Microkernel Buffer Overflow
What EVULNABLE says
EVULNABLE Risk · priority
77/100
Urgent
Intelligence coverage 75/90 — no pre-patch disclosure data
The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.
The evidence behind it
| Measure | Value | Source |
|---|---|---|
| CVSS base score | 9.8 | NVD |
| FIRST EPSS | 0.611 (99.09th pctl) | FIRST |
| Actively exploited | Confirmed | CISA KEV |
| Ransomware campaign use | Unknown or none | CISA KEV |
| CISA remediation deadline | 2022-02-01 — Overdue by 4.6 years | CISA KEV |
What CISA says to do
The primary records
This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.