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CVE-2022-20837— Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability

CVSS 8.6 · High EPSS 0.95% · P76
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I. Basic Information for CVE-2022-20837

Vulnerability Information
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Vulnerability Title
Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the DNS application layer gateway (ALG) functionality that is used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to a logic error that occurs when an affected device inspects certain TCP DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through the affected device that is performing NAT for DNS packets. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on the affected device. Note: This vulnerability can be exploited only by sending IPv4 TCP packets through an affected device. This vulnerability cannot be exploited by sending IPv6 traffic.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对因果或异常条件的不恰当检查
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco IOS XE Software 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XE Software是美国思科（Cisco）公司的一个操作系统。用于企业有线和无线访问，汇聚，核心和WAN的单一操作系统，Cisco IOS XE降低了业务和网络的复杂性。 Cisco IOS XE Software存在代码问题漏洞，该漏洞源于在检查某些TCP DNS数据包时发生逻辑错误。
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 IOS XE Software n/a -

II. Public POCs for CVE-2022-20837

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III. Intelligence Information for CVE-2022-20837

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Same Patch Batch · Cisco · 2022-10-10 · 7 CVEs total

CVE-2022-208708.6 HIGHCisco IOS XE Software for Catalyst Switches MPLS Denial of Service Vulnerability
CVE-2022-209207.7 HIGHCisco IOS and IOS XE Software SSH Denial of Service Vulnerability
CVE-2022-209157.4 HIGHCisco IOS XE Software IPv6 VPN over MPLS Denial of Service Vulnerability
CVE-2022-209446.1 MEDIUMCisco IOS XE Software for Catalyst 9200 Series Switches Arbitrary Code Execution Vulnerabi
CVE-2022-208305.3 MEDIUMCisco Software-Defined Application Visibility and Control on Cisco vManage Authentication
CVE-2022-208644.6 MEDIUMCisco IOS XE ROM Monitor Software for Catalyst Switches Information Disclosure Vulnerabili

IV. Related Vulnerabilities

Same product: Cisco IOS XE Software
Same vendor: Cisco
Same weakness: CWE-754

V. Comments for CVE-2022-20837

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