CVE-2026-20052
Cisco Secure Firewall Threat Defense Software Snort 3 Memory Management Denial of Service Vulnerability
- State
- Published
- Severity
- 5.8 Medium
- Published
- Mar 4, 2026
- Updated
- Mar 4, 2026
- Reserved
- Oct 8, 2025
Description
A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.
This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.8 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L | cisco |
Weaknesses
- CWE-788 Access of Memory Location After End of Buffer
Affected Products
| Product | Versions |
|---|---|
Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco |
|
References
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