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I. Basic Information for CVE-2026-20066
Vulnerability Information

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Vulnerability Title
Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in the JSTokenizer normalization logic when the HTTP inspection normalizes JavaScript. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly. JSTokenizer is not enabled by default.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco Secure Firewall Threat Defense和Cisco IOS XE Software 资源管理错误漏洞
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存在资源管理错误漏洞,该漏洞源于Snort 3检测引擎的JSTokenizer规
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
VendorProductAffected VersionsCPESubscribe
CiscoCisco Secure Firewall Threat Defense (FTD) Software 7.4.0 -
CiscoCisco UTD SNORT IPS Engine Software 17.3.1a -
II. Public POCs for CVE-2026-20066
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III. Intelligence Information for CVE-2026-20066
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IV. Related Vulnerabilities
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