What is CVE-2021-1446?

CVE-2021-1446 is a high-severity vulnerability in Cisco iOS Xe Software, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 8.6/10. Published 2021-03-24.

How severe is CVE-2021-1446?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Cisco iOS Xe Software

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.

EPSS: 0.015 (71.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xe Software — versions n/a
Cisco Ios_xe — versions 3.7.0bs, 3.7.0s, 3.7.0xas

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1446?: CVE-2021-1446 is a high-severity vulnerability in Cisco iOS Xe Software, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 8.6/10. Published 2021-03-24.
How severe is CVE-2021-1446?: High severity. CVSS v3 base score is 8.6 out of 10.