CVE-2021-1495— Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability
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I. Basic Information for CVE-2021-1495
Vulnerability Information
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Vulnerability Title
Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect handling of specific HTTP header parameters. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file policy for HTTP packets and deliver a malicious payload.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco Firepower Threat Defense 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Firepower Threat Defense（FTD）是美国思科（Cisco）公司的一套提供下一代防火墙服务的统一软件。 Cisco Firepower Threat Defense (FTD 存在安全特征问题漏洞，该漏洞源于对特定HTTP标头参数的不正确处理导致的。远程攻击者可以发送特制的HTTP数据包，以绕过针对HTTP数据包配置的文件策略，并传递恶意负载。以下产品及版本受到影响：Cisco Firepower Threat Defense (FTD): 6.2.2, 6.2.3, 6
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 Firepower Threat Defense Software | n/a | - |
II. Public POCs for CVE-2021-1495
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Cisco · 2021-04-29 · 17 CVEs total
| CVE-2021-1445 | 8.6 HIGH | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi |
| CVE-2021-1501 | 8.6 HIGH | Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software SIP |
| CVE-2021-1504 | 8.6 HIGH | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi |
| CVE-2021-1493 | 8.5 HIGH | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi |
| CVE-2021-1476 | 6.7 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Command I |
| CVE-2021-1488 | 6.7 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software for Firep |
| CVE-2021-1256 | 6.0 MEDIUM | Cisco Firepower Threat Defense Software Command File Overwrite Vulnerability |
| CVE-2021-1369 | 5.4 MEDIUM | Cisco Firepower Device Manager On-Box Software XML External Entity Vulnerability |
| CVE-2021-1456 | 4.8 MEDIUM | Cisco Firepower Management Center Software Cross-Site Scripting Vulnerabilities |
| CVE-2021-1457 | 4.8 MEDIUM | Cisco Firepower Management Center Software Cross-Site Scripting Vulnerabilities |
| CVE-2021-1458 | 4.8 MEDIUM | Cisco Firepower Management Center Software Cross-Site Scripting Vulnerabilities |
| CVE-2021-1477 | 4.3 MEDIUM | Cisco Firepower Management Center Software Policy Vulnerability |
| CVE-2021-1402 | Cisco Firepower Threat Defense Software SSL Decryption Policy Denial of Service Vulnerabil | |
| CVE-2021-1448 | Cisco Firepower Threat Defense Software Command Injection Vulnerability | |
| CVE-2021-1455 | Cisco Firepower Management Center Software Cross-Site Scripting Vulnerabilities | |
| CVE-2021-1489 | Cisco Firepower Device Manager Software Filesystem Space Exhaustion Denial of Service Vuln |
IV. Related Vulnerabilities
Same product: Cisco Firepower Threat Defense Software
- CVE-2025-20268
Cisco Secure Firewall Threat Defense Software Geolocation Re - CVE-2025-20222
Cisco Adaptive Security Appliance Software and Firepower Thr - CVE-2025-20217
Cisco Firepower Threat Defense Intrusion Detection Denial of - CVE-2021-1494
Snort 安全漏洞 - CVE-2021-34753
Cisco Firepower Threat Defense Ethernet Industrial Protocol
Same vendor: Cisco
- CVE-2026-20219
Cisco Slido 安全漏洞 - CVE-2026-20034
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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
V. Comments for CVE-2021-1495
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