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CVE-2021-1446

HIGHCVSS 7.5/10EPSS 1.49%

Last modified

CVE-2021-1446 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
1.49%

70.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe3.7.0bs
CiscoIos Xe3.7.0s
CiscoIos Xe3.7.0xas
CiscoIos Xe3.7.0xbs
CiscoIos Xe3.7.1as
CiscoIos Xe3.7.1s
CiscoIos Xe3.7.2s
CiscoIos Xe3.7.2ts
CiscoIos Xe3.7.3s
CiscoIos Xe3.7.4as
CiscoIos Xe3.7.4s
CiscoIos Xe3.7.5s
CiscoIos Xe3.7.6s
CiscoIos Xe3.7.7s
CiscoIos Xe3.7.8s
CiscoIos Xe3.8.0s
CiscoIos Xe3.8.1s
CiscoIos Xe3.8.2s
CiscoIos Xe3.9.0as
CiscoIos Xe3.9.0s
CiscoIos Xe3.9.0xas
CiscoIos Xe3.9.1as
CiscoIos Xe3.9.1s
CiscoIos Xe3.9.2s
CiscoIos Xe3.10.0s
CiscoIos Xe3.10.1s
CiscoIos Xe3.10.1xbs
CiscoIos Xe3.10.1xcs
CiscoIos Xe3.10.2as
CiscoIos Xe3.10.2s
CiscoIos Xe3.10.2ts
CiscoIos Xe3.10.3s
CiscoIos Xe3.10.4s
CiscoIos Xe3.10.5s
CiscoIos Xe3.10.6s
CiscoIos Xe3.10.7s
CiscoIos Xe3.10.8as
CiscoIos Xe3.10.8s
CiscoIos Xe3.10.9s
CiscoIos Xe3.10.10s
CiscoIos Xe3.11.0s
CiscoIos Xe3.11.1s
CiscoIos Xe3.11.2s
CiscoIos Xe3.11.3s
CiscoIos Xe3.11.4s
CiscoIos Xe3.12.0as
CiscoIos Xe3.12.0s
CiscoIos Xe3.12.1s
CiscoIos Xe3.12.2s
CiscoIos Xe3.12.3s

Showing 50 of 265 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1446?
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.
How severe is CVE-2021-1446?
CVE-2021-1446 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.49% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1446?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1446?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST