Heap-based buffer overflow in Cisco Systems, Inc products - CVE-2026-20185

Vulnerability identifier: #VU130419

CSH Severity: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2026-20185

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
SG350-28P 28-Port Gigabit PoE Managed Switch
SG350-28MP 28-Port Gigabit PoE Managed Switch
SG350-52P 52-Port Gigabit PoE Managed Switch
SG350-52MP 52-Port Gigabit Max-PoE Managed Switch
SG350X-24 24-Port Gigabit Stackable Managed Switch
SG350X Stackable Managed Switch

Software vendor:
Cisco Systems, Inc

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the Simple Network Management Protocol (SNMP) subsystem. A remote user can send a specially crafted SNMP request, trigger a heap-based buffer overflow and cause a denial of service condition on the target system.

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

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