CVE-2022-20675Network attack vector

SNMP service crash via TCP port 199

Published Apr 6, 2022 · Updated Nov 6, 2024

Denial of service in Cisco Secure Web Appliance running vulnerable AsyncOS releases allows remote attackers to crash the SNMP service. The TCP/IP stack leaves TCP port 199 open, and establishing a connection through that listener terminates the SNMP service. No authentication or user interaction is required; the bounded consequence is interruption of SNMP rather than loss of appliance data or policy control.

CVSS severity5.3
Medium
EPSS probability1.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco Secure Web Appliance running vulnerable AsyncOS releases allows remote attackers to crash the SNMP service. The TCP/IP stack leaves TCP port 199 open, and establishing a connection through that listener terminates the SNMP service. No authentication or user interaction is required; the bounded consequence is interruption of SNMP rather than loss of appliance data or policy control.

The record

CVE
CVE-2022-20675
Published
Apr 6, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco Secure Web Appliance
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Secure Web Applianceversion=n/a

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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