Secure Firewall ASA and FTD
CVE-2025-20359: Multiple Cisco Products Snort 3 MIME Information Disclosure or Denial of Service Vulnerability
Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the disclosure of possible sensitive data or cause the Snort 3 Detection Engine to crash.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 6.5
EPSS0.48%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 Cyber Vision 3.0 | See the advisory |
| Cisco Cyber Vision 3.0 | See the advisory |
| Cisco Cyber Vision 3.0 | See the advisory |
| Cisco Cyber Vision 3.0 | See the advisory |
| Cisco Cyber Vision 3.1 | See the advisory |
| Cisco Cyber Vision 3.0 | See the advisory |
| Cisco Cyber Vision 3.1 | See the advisory |
| Cisco Cyber Vision 3.1 | See the advisory |
| Cisco Cyber Vision 3.2 | See the advisory |
| Cisco Cyber Vision 3.0 | See the advisory |
| Cisco Cyber Vision 3.2 | See the advisory |
| Cisco Cyber Vision 3.0 | See the advisory |
| Cisco Cyber Vision 3.2 | See the advisory |
| Cisco Cyber Vision 3.2 | See the advisory |
| Cisco Cyber Vision 3.2 | See the advisory |
| Cisco Cyber Vision 4.0 | See the advisory |
| Cisco Cyber Vision 4.0 | See the advisory |
| Cisco Cyber Vision 4.0 | See the advisory |
| Cisco Cyber Vision 4.0 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 4.2 | See the advisory |
| Cisco Cyber Vision 4.2 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 4.2 | See the advisory |
| Cisco Cyber Vision 4.2 | See the advisory |
| Cisco Cyber Vision 4.2 | See the advisory |
| Cisco Cyber Vision 4.2 | See the advisory |
| Cisco Cyber Vision 4.2 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 4.3 | See the advisory |
| Cisco Cyber Vision 4.3 | See the advisory |
| Cisco Cyber Vision 4.3 | See the advisory |
| Cisco Cyber Vision 4.3 | See the advisory |
| Cisco Cyber Vision 4.4 | See the advisory |
| Cisco Cyber Vision 4.4 | See the advisory |
| Cisco Cyber Vision 4.4 | See the advisory |
| Cisco Cyber Vision 4.4 | See the advisory |
| Cisco Cyber Vision 4.1 | See the advisory |
| Cisco Cyber Vision 5.0 | See the advisory |
| Cisco Cyber Vision 5.0 | See the advisory |
| Cisco Cyber Vision 5.0 | See the advisory |
| Cisco Cyber Vision 5.1 | See the advisory |
| Cisco Cyber Vision 5.1 | See the advisory |
| Cisco Cyber Vision 5.1 | See the advisory |
| Cisco Cyber Vision 5.1 | See the advisory |
| Cisco Cyber Vision 5.2 | See the advisory |
| Cisco Cyber Vision 5.2 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | 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 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | 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 7.6 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 3.17 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 3.17 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.2 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.1 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.4 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.5 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.5 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.4 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.4 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.7 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.8 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.7 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.9 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 16.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.9 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.11 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.12 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.3 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | 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 17.6 | 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 17.6 | See the advisory |
| Cisco UTD SNORT IPS Engine Software 17.6 | 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 17.15 | 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 17.15 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the disclosure of possible sensitive data or cause the Snort 3 Detection Engine to crash.
This vulnerability is due to an error in the logic of buffer handling when the MIME fields of the HTTP header are parsed. This can result in a buffer under-read. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to induce one of two possible outcomes: the unexpected restarting of the Snort 3 Detection Engine, which could cause a denial of service (DoS) condition, or information disclosure of sensitive information in the Snort 3 data stream. Due to the under-read condition, it is possible that sensitive information that is not valid connection data could be returned.
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.