CVE-2021-1446 Detail
Current 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.
Analysis 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.
Severity
References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-754 | Improper Check for Unusual or Exceptional Conditions | Cisco Systems, Inc. |
Change History
2 change records found show changes
Initial Analysis 3/29/2021 2:59:44 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CPE Configuration | Record truncated, showing 500 of 13561 characters. View Entire Change Record OR
*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:*:*
|
|
| Added | CVSS V2 |
NIST (AV:N/AC:M/Au:N/C:N/I:N/A:C) |
|
| Added | CVSS V3.1 |
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
|
| Changed | Reference Type |
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-hbBS7SZE No Types Assigned |
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-hbBS7SZE Vendor Advisory |
CVE Modified by Cisco Systems, Inc. 3/24/2021 5:15:14 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Changed | Description | Record truncated, showing 500 of 796 characters. View Entire Change Record 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 exploi |
Record truncated, showing 500 of 790 characters. View Entire Change Record 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 c |
Quick Info
CVE Dictionary Entry:
CVE-2021-1446
NVD Published Date:
03/24/2021
NVD Last Modified:
03/29/2021
Source:
Cisco Systems, Inc.