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CVE-2026-20222— Cisco Secure Adaptive Security Appliance Software and Secure Firewall Threat Defense Software EIGRP Denial of Service Vulnerability

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 安全防火墙自适应安全设备（ASA）软件以及 Cisco 安全防火墙威胁防护（FTD）软件中 EIGRP 协议实现存在漏洞，允许未认证的相邻网络攻击者使设备意外重启，从而导致服务拒绝（DoS）状况。 该漏洞源于在处理 EIGRP 更新报文时资源管理不当。攻击者可以通过向受影响设备以较高速率发送精心构造的 EIGRP 更新报文来利用此漏洞。成功利用后，攻击者可引发内存泄漏，最终导致受影响设备意外重启。

CVSS 7.4 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 89

VendorProduct Version RangeStatus
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1 affected
9.19.1.5 affected
9.19.1.9 affected
9.19.1.12 affected
9.19.1.18 affected
9.20.1 affected
9.19.1.22 affected
9.20.1.5 affected
… +56 more rows
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.3.0 affected
7.3.1 affected
7.3.1.1 affected
7.4.0 affected
7.4.1 affected
7.4.1.1 affected
7.3.1.2 affected
7.6.0 affected
… +17 more rows
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I. Basic Information for CVE-2026-20222

Vulnerability Information
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Vulnerability Title
Cisco Secure Adaptive Security Appliance Software and Secure Firewall Threat Defense Software EIGRP Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper resource management when handling EIGRP update messages. An attacker could exploit this vulnerability by sending crafted EIGRP updates at a high rate to an affected device. A successful exploit could allow the attacker to trigger a memory leak that will eventually cause the affected device to reload unexpectedly.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1 -
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.3.0 -

II. Public POCs for CVE-2026-20222

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III. Intelligence Information for CVE-2026-20222

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Vendor Advisories for CVE-2026-20222 (1)

Same Patch Batch · Cisco · 2026-09-16 · 79 CVEs total

CVE-2026-20192 10.0 CRITICAL Cisco Identity Services Engine Hardening Release - Access Control Vulnerabilities
CVE-2026-76460 10.0 CRITICAL Cisco Identity Services Engine Authentication Bypass Vulnerability
CVE-2026-76423 10.0 CRITICAL Cisco ISE API Authentication Bypass Vulnerability
CVE-2026-20130 10.0 CRITICAL Cisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities
CVE-2026-20332 9.9 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20307 9.9 CRITICAL Cisco Identity Services Engine Remote Code Execution Vulnerability
CVE-2026-20234 9.9 CRITICAL Cisco Identity Services Engine Hardening Release - Insuffiencently Protected Credential Vu
CVE-2026-20324 9.9 CRITICAL Cisco Secure Firewall Management Center sftunnel Root Arbitrary Code Exectution Vulnerabil
CVE-2026-20325 9.9 CRITICAL Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Improper Neutra
CVE-2026-20329 9.9 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20322 9.9 CRITICAL Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Improper Access
CVE-2026-20330 9.9 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20242 9.8 CRITICAL Cisco Secure Firewall Management Center Software Java Deserialization Remote Code Executio
CVE-2026-20326 9.8 CRITICAL Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Missing Authent
CVE-2026-20331 9.6 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20306 9.1 CRITICAL Cisco Identity Services Engine Command Injection Vulnerability
CVE-2026-20211 9.1 CRITICAL Cisco Identity Services Engine Remote Code Execution Vulnerability
CVE-2026-20341 9.1 CRITICAL Cisco Secure Firewall Management Center Software sftunnel Deserialization Root Command Exe
CVE-2026-20176 9.1 CRITICAL Cisco Identity Services Engine Remote Code Execution Vulnerability
CVE-2026-20284 9.1 CRITICAL Cisco Identity Search Engine SXP REST API SQL Injection Vulnerability

Showing top 20 of 79 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-401

V. Comments for CVE-2026-20222

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