Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-1446

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
24/03/2021
Last modified:
07/11/2023

Description

A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:M/Au:N/C:N/I:N/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.10 HIGH
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete

Base Score 2.0
7.10
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:ios_xe:3.7.0bs:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.0xas:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.0xbs:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.1as:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.2s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.2ts:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.3s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.4as:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.4s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.5s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.6s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.7s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7.8s:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools