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I. Basic Information for CVE-2021-1534
Vulnerability Information

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Vulnerability Title
Cisco Email Security Appliance URL Filtering Bypass Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the antispam protection mechanisms of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the URL reputation filters on an affected device. This vulnerability is due to improper processing of URLs. An attacker could exploit this vulnerability by crafting a URL in a particular way. A successful exploit could allow the attacker to bypass the URL reputation filters that are configured for an affected device, which could allow malicious URLs to pass through the device.
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
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco AsyncOS for Cisco Email Security Appliance 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Email Security Appliance(ESA)和Cisco AsyncOS都是美国思科(Cisco)公司的产品。Cisco Email Security Appliance是一个电子邮件安全设备。Cisco AsyncOS是一款应用于思科设备的操作系统。 Cisco ESA存在输入验证错误漏洞,该漏洞源于思科电子邮件安全设备(ESA)的AsyncOS软件反垃圾邮件保护机制对于url处理不当造成的。攻击者可以通过以特定方式创建URL来利用这个漏洞。成功的攻击可以让攻击者绕过为受影响设
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 Email Security Appliance (ESA) n/a -
II. Public POCs for CVE-2021-1534
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III. Intelligence Information for CVE-2021-1534
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IV. Related Vulnerabilities
V. Comments for CVE-2021-1534

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