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CVE-2026-20185— Cisco SG350 and SG350X Series Managed Switches SNMP Denial of Service Vunerability

Quick assessment

Affected
Cisco Cisco Small Business Smart and Managed Switches
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco 350X Series和Cisco 350 Series都是美国思科（Cisco）公司的一系列企业级可堆叠以太网交换机。 Cisco 350X Series和Cisco 350 Series存在安全漏洞，该漏洞源于解析特定SNMP请求响应数据时错误处理不当，可能导致经过身份验证的远程攻击者发送特定SNMP请求导致设备意外重新加载，造成拒绝服务。

CVSS 7.7 · High EPSS 0.39% · P30

Affected Version Matrix 2

VendorProduct Version RangeStatus
Cisco Cisco Small Business Smart and Managed Switches 2.5.9.54 affected
2.5.9.55 affected
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I. Basic Information for CVE-2026-20185

Vulnerability Information
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Vulnerability Title
Cisco SG350 and SG350X Series Managed Switches SNMP Denial of Service Vunerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco 350X Series和Cisco 350 Series 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco 350X Series和Cisco 350 Series都是美国思科（Cisco）公司的一系列企业级可堆叠以太网交换机。 Cisco 350X Series和Cisco 350 Series存在安全漏洞，该漏洞源于解析特定SNMP请求响应数据时错误处理不当，可能导致经过身份验证的远程攻击者发送特定SNMP请求导致设备意外重新加载，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Small Business Smart and Managed Switches 2.5.9.54 -

II. Public POCs for CVE-2026-20185

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III. Intelligence Information for CVE-2026-20185

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Vendor Advisories for CVE-2026-20185 (1)

Same Patch Batch · Cisco · 2026-05-06 · 12 CVEs total

CVE-2026-20034 8.8 HIGH Cisco Unity Connection Remote Code Execution Vulnerability
CVE-2026-20167 7.7 HIGH Cisco IoT Field Network Director Remote Device Denial of Service Vulnerability
CVE-2026-20035 7.2 HIGH Cisco Unity Connection Server-Side Request Forgery Vulnerability
CVE-2026-20168 6.5 MEDIUM Cisco IoT Field Network Director Path Traversal Vulnerability
CVE-2026-20169 6.4 MEDIUM Cisco IoT Field Network Director Command Injection Vulnerability
CVE-2026-20219 5.4 MEDIUM Cisco Slido 安全漏洞
CVE-2026-20195 5.3 MEDIUM Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
CVE-2026-20193 4.3 MEDIUM Cisco Identity Services Engine Authentication Bypass Vulnerability
CVE-2026-20189 4.3 MEDIUM Cisco Prime Infrastructure Information Disclosure Vulnerability
CVE-2026-20172 4.3 MEDIUM Cisco Enterprise Chat and Email Lite Agent File Upload Vulnerability
CVE-2026-20188 Cisco Crosswork Network Controller and Cisco Network Services Orchestrator Advisory

IV. Related Vulnerabilities

Same product: Cisco Small Business Smart and Managed Switches
Same vendor: Cisco
Same weakness: CWE-122

V. Comments for CVE-2026-20185

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