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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0227
SNMP Denial of Service Vulnerability in Cisco

Original Issue Date:May 09, 2026

Severity Rating: HIGH

Systems Affected

  • Cisco SG350 and SG350X Series Managed Switch Firmware Releases 2.5.9.54 or 2.5.9.55
  • SG350-28P Switches
  • SG350-28MP Switches
  • SG350-52P Switches
  • SG350-52MP Switches
  • SG350X Series Switches

Overview

A vulnerability has been reported in the Simple Network Management Protocol (SNMP) subsystem of Cisco 350 Series Managed Switches (SG350) and Cisco 350X Series Stackable Managed Switches (SG350X), which could allow an authenticated, remote attacker to cause a Denial of Service (DoS) condition on the affected system.

Target Audience:
All IT Administrator and individuals responsible for maintaining and updating software.

Risk Assessment:
High risk of data manipulation and service disruption.

Impact Assessment:
Potential impact on confidentiality, integrity and availability of system.

Description

A Denial of Service (DoS) vulnerability exists in the SNMP subsystem due to improper error handling while parsing response data for a specific SNMP request. A remote attacker could exploit this vulnerability by sending a specially crafted SNMP request to the affected device.

Successful exploitation of this vulnerability could allow an attacker to cause the device to reload unexpectedly, resulting in a denial-of-service condition.

Note: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMPv2c or earlier, the attacker must know a valid read-write or read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.

Solution

Apply appropriate fix/patches as mentioned in Cisco Advisory:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg350-snmp-dos-GEFZr2Tj

Vendor Information

Cisco
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg350-snmp-dos-GEFZr2Tj

References

Cisco
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg350-snmp-dos-GEFZr2Tj

CVE Name
CVE-2026-20185

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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