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CVE-2021-1534— Cisco Email Security Appliance URL Filtering Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco Email Security Appliance (ESA)
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 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

CVSS 5.8 · Medium EPSS 1.07% · P64
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco 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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Same Patch Batch · Cisco · 2021-10-06 · 23 CVEs total

CVE-2021-34748 8.8 HIGH Cisco Intersight Virtual Appliance Command Injection Vulnerability
CVE-2021-34710 8.8 HIGH Cisco ATA 190 Series Analog Telephone Adapter Software Vulnerabilities
CVE-2021-34735 8.8 HIGH Cisco ATA 190 Series Analog Telephone Adapter Software Vulnerabilities
CVE-2021-34698 8.6 HIGH Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability
CVE-2021-1594 7.5 HIGH Cisco Identity Services Engine Privilege Escalation Vulnerability
CVE-2021-34788 7.0 HIGH Cisco AnyConnect Secure Mobility Client for Linux and Mac OS with VPN Posture (HostScan) M
CVE-2021-34706 6.4 MEDIUM Cisco Identity Services Engine XML External Entity Injection Vulnerability
CVE-2021-34742 6.1 MEDIUM Cisco Vision Dynamic Signage Director Reflected Cross-Site Scripting Vulnerability
CVE-2021-34711 5.5 MEDIUM Cisco IP Phone Software Arbitrary File Read Vulnerability
CVE-2021-34766 5.4 MEDIUM Cisco Smart Software Manager Privilege Escalation Vulnerability
CVE-2021-34744 4.9 MEDIUM Cisco Business 220 Series Smart Switches Static Key and Password Vulnerabilities
CVE-2021-34757 4.9 MEDIUM Cisco Business 220 Series Smart Switches Static Key and Password Vulnerabilities
CVE-2021-34772 4.7 MEDIUM Cisco Orbital Open Redirect Vulnerability
CVE-2021-34758 4.4 MEDIUM Cisco TelePresence Collaboration Endpoint and RoomOS Software Denial of Service Vulnerabi
CVE-2021-34775 4.3 MEDIUM Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabiliti
CVE-2021-34776 4.3 MEDIUM Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabiliti
CVE-2021-34777 4.3 MEDIUM Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabiliti
CVE-2021-34778 4.3 MEDIUM Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabiliti
CVE-2021-34779 4.3 MEDIUM Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabiliti
CVE-2021-34780 4.3 MEDIUM Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabiliti

Showing top 20 of 23 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco Email Security Appliance (ESA)
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2021-1534

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