Secure Firewall ASA and FTD
CVE-2026-20058: Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Denial of Service Vulnerability
Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 5.8
EPSS0.40%Chance of exploitation in 30 days
Public exploitNot tracked
FixNot yet
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.3 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.3 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.3 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.3 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.6 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.7 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.6 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.6 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.7 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.6 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.7 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.9 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.13 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.9 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.14 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.15 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.9 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.16 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.15 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.15 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.17 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.15 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.15 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.15 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.18 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.18 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.15 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.18 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.
These vulnerabilities are due to improper error checking when decompressing VBA data. An attacker could exploit these vulnerabilities by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to unexpectedly restart, causing a DoS condition.
Exploitation
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.