VDB
CVE-2026-20295
CVE-2026-20295
PUBLISHED
CVSS 8.6 HIGH
Reported by cisco · Published September 16, 2026
A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to exhaust the available memory of an affected device. This vulnerability is due to improper management of memory resources during sftunnel TLS connection setup. An attacker could exploit this vulnerability by sending crafted sftunnel TLS frames to an affected device during the connection setup. A successful exploit could allow the attacker to exhaust the available memory on the affected device, which could result in a DoS condition.
Risk Scores
CVSS 3.1
8.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.0, 7.0.0.1, 7.0.1 |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 7.0.0, 7.0.0.1, 7.0.1 |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 10.0.1, 7.2.3, 7.2.3.1 |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 7.0.0.1, 7.0.1, 7.0.1.1 |
Timeline
- Sep 16, 2026 Coalition ESS Score
- Sep 16, 2026 CVE Published
- Sep 17, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
- Sep 18, 2026 CVE Updated