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7.7
CVE-2026-20185
Cisco · Cisco Small Business Smart and Managed Switches

Cisco SG350 and SG350X Series Managed Switches SNMP Denial of Service Vunerability

Description

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco 350 Series Managed Switches (SG350) and Cisco 350X Series Stackable Managed Switches (SG350X) firmware could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.  This vulnerability is due to improper error handling when parsing response data for a specific SNMP request. An attacker could exploit this vulnerability by sending a specific SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. 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.

Affected Products

VendorProductVersions
CiscoCisco Small Business Smart and Managed Switches2.5.9.54, 2.5.9.55

References

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

Related News (1 articles)

Tier C
VulDB6h ago
CVE-2026-20185 | Cisco Small Business Smart and Managed Switches 2.5.9.54/2.5.9.55 SNMP Subsystem heap-based overflow (cisco-sa-sg350-snmp-dos-GEFZr2Tj)
→ No new info (linked only)
CVSS 3.17.7 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CISA KEV❌ No
Actively exploited❌ No
CWECWE-122
PublishedMay 6, 2026
Last enriched6h ago
Trending Score27
Source articles1
Independent1
Info Completeness8/14
Missing: epss, kev, exploit, patch, iocs, mitre_attack

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Verification

State: verified
Confidence: 0%

Vulnerability Timeline

CVE Published
May 6, 2026
Discovered by ZDM
May 6, 2026