What is CVE-2022-20837?

CVE-2022-20837 is a high-severity vulnerability in Cisco Asr 1000-Esp100-X, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 8.6/10. Published 2022-10-10.

How severe is CVE-2022-20837?

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

Vulnerability in Cisco Asr 1000-Esp100-X

CVE-2022-20837

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

EPSS: 0.009 (58.0th 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

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

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

Frequently asked questions

What is CVE-2022-20837?: CVE-2022-20837 is a high-severity vulnerability in Cisco Asr 1000-Esp100-X, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 8.6/10. Published 2022-10-10.
How severe is CVE-2022-20837?: High severity. CVSS v3 base score is 8.6 out of 10.