CVE-2022-20675: Multiple Cisco Security Products Simple Network Management Protocol Service Denial of Service Vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-06 · updated 2026-06-17
Weakness: CWE-248

Description

A vulnerability in the TCP/IP stack of Cisco Email Security Appliance (ESA), Cisco Web Security Appliance (WSA), and Cisco Secure Email and Web Manager, formerly Security Management Appliance, could allow an unauthenticated, remote attacker to crash the Simple Network Management Protocol (SNMP) service, resulting in a denial of service (DoS) condition. This vulnerability is due to an open port listener on TCP port 199. An attacker could exploit this vulnerability by connecting to TCP port 199. A successful exploit could allow the attacker to crash the SNMP service, resulting in a DoS condition.

Affected products

Cisco Asyncos: from 14.0 before 14.02.0-020; from 12.5 before 14.1.0-239; from 12.0 before 14.0.2-012 — fixed in 14.0.2-012, 14.02.0-020, 14.1.0-239

How to fix

Upgrade to a fixed version: Cisco Asyncos 14.0.2-012, 14.02.0-020, 14.1.0-239. Check the vendor advisory for mitigations.

References

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