CVE-2026-20082
A vulnerability in the handling of the embryonic connection limits in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause incoming TCP SYN packets to be dropped incorrectly. This vulnerability is due to improper handling of new, incoming TCP connections that are destined to management or data interfaces when the device is under a TCP SYN flood attack. An attacker could exploit this vulnerability by sending a crafted stream of traffic to an affected device. A successful exploit could allow the attacker to prevent all incoming TCP connections to the device from being established, including remote management access, Remote Access VPN (RAVPN) connections, and all network protocols that are TCP-based. This results in a denial of service (DoS) condition for affected features.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.6
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- EPSS probability
- 0.41%
- CWE
- CWE-772
- Published
- 2026-03-04
- Last modified
- 2026-03-12
Affected products
- Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Weakness type
Related vulnerabilities
- CVE-2026-72931 — Windows Secure Socket Tunneling Protocol (SSTP) Denial of Service Vulnerability
- CVE-2026-18149 — undici vulnerable to Denial of Service via orphaned RetryHandler response body
- CVE-2026-69664 — httpd parks a request worker indefinitely on a malformed chunk size sent after the headers
- CVE-2026-71380 — httpd applies no timeout while receiving a request body, parking a worker on a stalled client
- CVE-2026-77384 — libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion
- CVE-2026-59654 — Apache CloudStack: DoS caused by database connections leak
- CVE-2026-73508 — Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names
- CVE-2026-73215 — The coturn server can end in a state where it does not accept more requests with "even-port" enabled.