CVE-2026-20050— Cisco Secure Firewall Threat Defense Decryption Policy Denial of Service Vulnerability
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I. Basic Information for CVE-2026-20050
Vulnerability Information
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Vulnerability Title
Cisco Secure Firewall Threat Defense Decryption Policy Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the Do Not Decrypt exclusion feature of the SSL decryption feature of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management during the inspection of TLS 1.2 encrypted traffic. An attacker could exploit this vulnerability by sending crafted TLS 1.2 encrypted traffic through an affected device. A successful exploit could allow the attacker to cause a reload of an affected device. Note: This vulnerability only affects traffic that is encrypted by TLS 1.2. Other versions of TLS are not affected.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不恰当的资源关闭或释放
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco Secure Firewall Threat Defense 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Firewall Threat Defense是美国思科（Cisco）公司的一个集成式防火墙平台。 Cisco Secure Firewall Threat Defense存在安全漏洞，该漏洞源于检查TLS 1.2加密流量时内存管理不当，可能导致未经身份验证的远程攻击者发送特制的TLS 1.2加密流量，导致受影响设备重新加载，引发拒绝服务。
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 Threat Defense (FTD) Software | 7.0.0 | - |
II. Public POCs for CVE-2026-20050
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Cisco · 2026-03-04 · 50 CVEs total
| CVE-2026-20079 | 10.0 CRITICAL | Cisco Secure Firewall Management Center 安全漏洞 |
| CVE-2026-20131 | 10.0 CRITICAL | Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability |
| 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-2026-20101 | 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-2026-20100 | 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-2026-20014 | 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-2026-20020 | 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-2026-20064 | 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-2026-20149 | 6.1 MEDIUM | Cisco Webex 跨站脚本漏洞 |
| CVE-2026-20070 | 6.1 MEDIUM | Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Softw |
| CVE-2026-20023 | 6.1 MEDIUM | Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 缓冲区 |
Showing top 20 of 50 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Cisco Secure Firewall Threat Defense (FTD) Software
- CVE-2026-20064
Cisco Secure Firewall Threat Defense 代码问题漏洞 - CVE-2026-20016
Cisco Secure Firewall Adaptive Security Appliance和Cisco Secu - CVE-2026-20066
Multiple Cisco Products Snort 3 TBD Denial of Service Vulner - CVE-2026-20065
Multiple Cisco Products Snort 3 TBD Denial of Service Vulner - CVE-2026-20063
Cisco Secure FTD Software Authenticated Command Injection Vu
Same vendor: Cisco
- CVE-2026-20219
Cisco Slido 安全漏洞 - CVE-2026-20034
Cisco Unity Connection Remote Code Execution Vulnerability - CVE-2026-20035
Cisco Unity Connection Server-Side Request Forgery Vulnerabi - CVE-2026-20167
Cisco IoT Field Network Director Remote Device Denial of Ser - CVE-2026-20169
Cisco IoT Field Network Director Command Injection Vulnerabi
Same weakness: CWE-404
- CVE-2026-8270
Open5GS SMF ogs_nas_parse_qos_rules denial of service - CVE-2026-8269
Open5GS SMF smf_nsmf_handle_create_sm_context denial of serv - CVE-2026-8268
Open5GS SMF OpenAPI_list_create denial of service - CVE-2026-8267
Open5GS SMF smf_nsmf_handle_created_data_in_vsmf denial of s - CVE-2026-8266
Open5GS SMF gsm-build.c gsm_build_pdu_session_establishment_
V. Comments for CVE-2026-20050
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