CVE-2025-20333
Cisco — Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
What EVULNABLE says
EVULNABLE Risk · priority
82/100
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 | 9.9 | NVD |
| FIRST EPSS | 0.707 (99.34th pctl) | FIRST |
| Actively exploited | Confirmed | CISA KEV |
| Ransomware campaign use | Unknown or none | CISA KEV |
| CISA remediation deadline | 2025-09-26 — Overdue by 11 months | CISA KEV |
What CISA says to do
- CISA Mitigation Instructions ↗
- www.cisa.gov/…/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions ↗
- www.cisa.gov/…/create-from-template ↗
- sec.cloudapps.cisco.com/…/asa_ftd_continued_attacks ↗
- sec.cloudapps.cisco.com/…/asa_ftd_continued_attacks#Details ↗
- sec.cloudapps.cisco.com/…/cisco-sa-asaftd-webvpn-z5xP8EUB ↗
- nvd.nist.gov/…/CVE-2025-20333 ↗
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.