PT-2021-2450 · Cisco · Cisco Ios Xe
Published
2021-03-24
·
Updated
2021-03-29
·
CVE-2021-1446
CVSS v3.1
8.6
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
Cisco IOS XE Software (affected versions not specified)
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.
Recommendations:
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
However, Cisco has released software updates that address this vulnerability.
There are no workarounds that address this vulnerability.
DoS
Improper Check for Exceptional Conditions
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Weakness Enumeration
Related Identifiers
Affected Products
Cisco Ios Xe