Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2025-20333
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L L N C H H H 9.9 .7065 99.4 YES
AFFECTED
Product Versions Fixed
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.8.1 – —
Cisco Secure Firewall Threat Defense (FTD) Software 6.2.3 – —
TIMELINE
Oct 10 Reserved by cisco
Sep 25 Added to CISA KEV, remediation due 2025-09-26
Sep 25 Published (CNA: cisco)
Aug 11 ENRICHED — CVE-2025-20333 (Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense). Received CVSS 9.9 and CPE data from NVD.
Description
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device.
This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| October 10, 2024 | Reserved | Reserved by cisco |
| September 25, 2025 | KEV ADDED | Added to CISA KEV, remediation due 2025-09-26 |
| September 25, 2025 | Published | Published (CNA: cisco) |
| August 11, 2026 | ENRICHED | ENRICHED — CVE-2025-20333 (Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense). Received CVSS 9.9 and CPE data from NVD. |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | — | 9.8.1 | — |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | — | 6.2.3 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-20333 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
