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CVE-2021-34698— Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco Web Security Appliance (WSA)
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 AsyncOS是美国思科（Cisco）公司的一款应用于思科设备的操作系统。 Cisco AsyncOS for Cisco Web Security Appliance存在安全漏洞，该漏洞源于受影响设备的代理服务的内存管理不当造成的。攻击者可以通过与受影响的设备建立大量HTTPS连接来利用该漏洞。如果攻击成功，攻击者可利用该漏洞可能会导致系统停止处理新连接，从而导致拒绝服务攻击。

CVSS 8.6 · High EPSS 1.43% · P72
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I. Basic Information for CVE-2021-34698

Vulnerability Information
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Vulnerability Title
Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the proxy service of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management in the proxy service of an affected device. An attacker could exploit this vulnerability by establishing a large number of HTTPS connections to the affected device. A successful exploit could allow the attacker to cause the system to stop processing new connections, which could result in a DoS condition. Note: Manual intervention may be required to recover from this situation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco AsyncOS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco AsyncOS是美国思科（Cisco）公司的一款应用于思科设备的操作系统。 Cisco AsyncOS for Cisco Web Security Appliance存在安全漏洞，该漏洞源于受影响设备的代理服务的内存管理不当造成的。攻击者可以通过与受影响的设备建立大量HTTPS连接来利用该漏洞。如果攻击成功，攻击者可利用该漏洞可能会导致系统停止处理新连接，从而导致拒绝服务攻击。
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 Web Security Appliance (WSA) n/a -

II. Public POCs for CVE-2021-34698

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III. Intelligence Information for CVE-2021-34698

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Vendor Advisories for CVE-2021-34698 (1)

Same Patch Batch · Cisco · 2021-10-06 · 23 CVEs total

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-2021-34748 8.8 HIGH Cisco Intersight Virtual Appliance Command Injection 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-2021-1534 5.8 MEDIUM Cisco Email Security Appliance URL Filtering Bypass 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-2021-34757 4.9 MEDIUM Cisco Business 220 Series Smart Switches Static Key and Password Vulnerabilities
CVE-2021-34744 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 Web Security Appliance (WSA)
Same vendor: Cisco
Same weakness: CWE-401

V. Comments for CVE-2021-34698

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