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CVE-2026-20082

Quick assessment

Affected
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Secure Firewall Adaptive Security Appliance是美国思科（Cisco）公司的一个企业级防火墙软件。 Cisco Secure Firewall Adaptive Security Appliance存在安全漏洞，该漏洞源于在TCP SYN泛洪攻击下对新传入TCP连接的处理不当，可能导致未经验证的远程攻击者造成拒绝服务。

CVSS 8.6 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-20082

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Firewall Adaptive Security Appliance 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Firewall Adaptive Security Appliance是美国思科（Cisco）公司的一个企业级防火墙软件。 Cisco Secure Firewall Adaptive Security Appliance存在安全漏洞，该漏洞源于在TCP SYN泛洪攻击下对新传入TCP连接的处理不当，可能导致未经验证的远程攻击者造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4.14 -

II. Public POCs for CVE-2026-20082

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III. Intelligence Information for CVE-2026-20082

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Vendor Advisories for CVE-2026-20082 (1)

Same Patch Batch · Cisco · 2026-03-04 · 50 CVEs total

CVE-2026-20079 10.0 CRITICAL Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulner
CVE-2026-20131 10.0 CRITICAL Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
CVE-2026-20039 8.6 HIGH Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL VPN Authentica
CVE-2026-20101 8.6 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure FTD Software 安全特征问题漏洞
CVE-2026-20103 8.6 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2026-20002 8.1 HIGH Cisco Secure Firewall Management Center SQL注入漏洞
CVE-2026-20014 7.7 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2026-20100 7.7 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2026-20105 7.7 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2026-20049 7.7 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2026-20062 7.2 HIGH Cisco Secure Firewall Adaptive Security Appliance 安全漏洞
CVE-2026-20025 6.8 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 输入验
CVE-2026-20024 6.8 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 缓冲区
CVE-2026-20020 6.8 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 输入验
CVE-2026-20050 6.8 MEDIUM Cisco Secure Firewall Threat Defense Decryption Policy Denial of Service Vulnerability
CVE-2026-20064 6.5 MEDIUM Cisco Secure Firewall Threat Defense 代码问题漏洞
CVE-2026-20001 6.5 MEDIUM Cisco Secure Firewall Management Center Software SQL Injection Vulnerabilities
CVE-2026-20070 6.1 MEDIUM Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Softw
CVE-2026-20022 6.1 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2026-20149 6.1 MEDIUM Cisco Webex 跨站脚本漏洞

Showing top 20 of 50 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Same vendor: Cisco
Same weakness: CWE-772

V. Comments for CVE-2026-20082

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