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CVE-2022-20795— Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco Adaptive Security Appliance (ASA) Software
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 Firepower Threat Defense（FTD）和Cisco Adaptive Security Appliances Software（ASA Software）都是美国思科（Cisco）公司的产品。Cisco Firepower Threat Defense是一套提供下一代防火墙服务的统一软件。Cisco Adaptive Security Appliances Software是一套防火墙和网络安全平台。该平台提供了对数据和网络资源的高度安全的访问等功能。 Cisco Fire

CVSS 5.8 · Medium EPSS 0.70% · P51
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I. Basic Information for CVE-2022-20795

Vulnerability Information
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Vulnerability Title
Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the implementation of the Datagram TLS (DTLS) protocol in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization, resulting in a denial of service (DoS) condition. This vulnerability is due to suboptimal processing that occurs when establishing a DTLS tunnel as part of an AnyConnect SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted DTLS traffic to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected VPN headend device. This could cause existing DTLS tunnels to stop passing traffic and prevent new DTLS tunnels from establishing, resulting in a DoS condition. Note: When the attack traffic stops, the device recovers gracefully.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Firepower Threat Defense和Cisco Adaptive Security Appliances Software 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Firepower Threat Defense（FTD）和Cisco Adaptive Security Appliances Software（ASA Software）都是美国思科（Cisco）公司的产品。Cisco Firepower Threat Defense是一套提供下一代防火墙服务的统一软件。Cisco Adaptive Security Appliances Software是一套防火墙和网络安全平台。该平台提供了对数据和网络资源的高度安全的访问等功能。 Cisco Fire
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 Adaptive Security Appliance (ASA) Software n/a -

II. Public POCs for CVE-2022-20795

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III. Intelligence Information for CVE-2022-20795

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Vendor Advisories for CVE-2022-20795 (1)

Same Patch Batch · Cisco · 2022-04-21 · 12 CVEs total

CVE-2022-20732 7.8 HIGH Cisco Virtualized Infrastructure Manager Privilege Escalation Vulnerability
CVE-2022-20783 7.5 HIGH Cisco TelePresence Collaboration Endpoint and RoomOS Software H.323 Denial of Service Vuln
CVE-2022-20773 7.5 HIGH Cisco Umbrella Virtual Appliance Static SSH Host Key Vulnerability
CVE-2022-20790 6.5 MEDIUM Cisco Unified Communications Products Arbitrary File Read Vulnerability
CVE-2022-20778 6.1 MEDIUM Cisco Webex Meetings Cross-Site Scripting Vulnerability
CVE-2022-20788 6.1 MEDIUM Cisco Unified Communications Products Cross-Site Scripting Vulnerability
CVE-2022-20787 5.7 MEDIUM Cisco Unified Communications Products Cross-Site Request Forgery Vulnerability
CVE-2022-20786 5.4 MEDIUM Cisco Unified Communications Manager IM & Presence Service SQL Injection Vulnerability
CVE-2022-20804 5.3 MEDIUM Cisco Unified Communications Products Denial of Service Vulnerability
CVE-2022-20789 4.9 MEDIUM Cisco Unified Communications Products Arbitrary File Write Vulnerability
CVE-2022-20805 4.1 MEDIUM Cisco Umbrella Secure Web Gateway File Decryption Bypass Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Adaptive Security Appliance (ASA) Software
Same vendor: Cisco
Same weakness: CWE-345

V. Comments for CVE-2022-20795

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