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CVE-2026-20054— Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Infinite Loop Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco Cyber Vision
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 Threat Defense和Cisco IOS XE Software都是美国思科（Cisco）公司的产品。Cisco Secure Firewall Threat Defense是一个集成式防火墙平台。Cisco IOS XE Software是一种网络操作系统。 Cisco Secure Firewall Threat Defense和Cisco IOS XE Software存在安全漏洞，该漏洞源于解压缩VBA数据时错误检查不当，可能导致未经身份验证的远

CVSS 5.8 · Medium EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-20054

Vulnerability Information
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Vulnerability Title
Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Infinite Loop Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.  This vulnerability is due to improper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to enter an infinite loop, causing a DoS condition.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Firewall Threat Defense和Cisco IOS XE Software 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Firewall Threat Defense和Cisco IOS XE Software都是美国思科（Cisco）公司的产品。Cisco Secure Firewall Threat Defense是一个集成式防火墙平台。Cisco IOS XE Software是一种网络操作系统。 Cisco Secure Firewall Threat Defense和Cisco IOS XE Software存在安全漏洞，该漏洞源于解压缩VBA数据时错误检查不当，可能导致未经身份验证的远
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 Cyber Vision 3.0.0 -
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0 -
Cisco Cisco UTD SNORT IPS Engine Software 3.17.1S -

II. Public POCs for CVE-2026-20054

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III. Intelligence Information for CVE-2026-20054

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Vendor Advisories for CVE-2026-20054 (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-2026-20103 8.6 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
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-2026-20082 8.6 HIGH Cisco Secure Firewall Adaptive Security Appliance 安全漏洞
CVE-2026-20039 8.6 HIGH Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL VPN Authentica
CVE-2026-20002 8.1 HIGH Cisco Secure Firewall Management Center SQL注入漏洞
CVE-2026-20049 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-2026-20100 7.7 HIGH Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2026-20014 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-2026-20050 6.8 MEDIUM Cisco Secure Firewall Threat Defense Decryption Policy Denial of Service Vulnerability
CVE-2026-20020 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-2026-20025 6.8 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 输入验
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

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

IV. Related Vulnerabilities

Same product: Cisco Cyber Vision
Same vendor: Cisco
Same weakness: CWE-835

V. Comments for CVE-2026-20054

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