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CiscoCVE-2022-20837

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

CVE-2022-20837

2022-10-1021:15:10

CWE-754

cisco

web.nvd.nist.gov

cve-2022-20837

cisco

ios xe

software

nat

dns

alg

dos

vulnerability

nvd

remote attacker

tcp

ipv4

CVSS3

8.6

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

AI Score

8.4

Confidence

High

EPSS

0.001

Percentile

45.4%

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-

VendorProductVersionCPE
ciscoios_xe-cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:*
ciscoasr_1000-esp100-x-cpe:2.3:h:cisco:asr_1000-esp100-x:-:*:*:*:*:*:*:*
ciscoasr_1000-esp200-x-cpe:2.3:h:cisco:asr_1000-esp200-x:-:*:*:*:*:*:*:*
ciscocatalyst_8500-cpe:2.3:h:cisco:catalyst_8500:-:*:*:*:*:*:*:*
ciscocatalyst_8500-4qc-cpe:2.3:h:cisco:catalyst_8500-4qc:-:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cisco	ios_xe	-	cpe:2.3:o:cisco:ios_xe:-:::::::*
cisco	asr_1000-esp100-x	-	cpe:2.3:h:cisco:asr_1000-esp100-x:-:::::::*
cisco	asr_1000-esp200-x	-	cpe:2.3:h:cisco:asr_1000-esp200-x:-:::::::*
cisco	catalyst_8500	-	cpe:2.3:h:cisco:catalyst_8500:-:::::::*
cisco	catalyst_8500-4qc	-	cpe:2.3:h:cisco:catalyst_8500-4qc:-:::::::*

CNA Affected

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