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[email protected]CVE-2022-20837

HistoryOct 10, 2022 - 9:15 p.m.

CVE-2022-20837

2022-10-1021:15:10

CWE-754

[email protected]

web.nvd.nist.gov

cve-2022-20837

cisco

ios xe

software

nat

dns

alg

dos

vulnerability

nvd

remote attacker

tcp

ipv4

8.6 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

8.4 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

45.5%

JSON

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.

Affected configurations

NVD

Node

ciscoios_xeMatch-

AND

ciscoasr_1000-esp100-xMatch-

ciscoasr_1000-esp200-xMatch-

ciscocatalyst_8500Match-

ciscocatalyst_8500-4qcMatch-

CPENameOperatorVersion
cisco:ios_xecisco ios xeeq-

CPE	Name	Operator	Version
cisco:ios_xe	cisco ios xe	eq	-

CNA Affected

[
  {
    "vendor": "Cisco",
    "product": "Cisco IOS XE Software ",
    "versions": [
      {
        "version": "n/a",
        "status": "affected"
      }
    ]
  }
]