CVE-2020-3235

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software on Catalyst 4500 Series Switches could allow an authenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient input validation when the software processes specific SNMP object identifiers. An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: To exploit this vulnerability by using SNMPv2c or earlier, the attacker must know the SNMP read-only community string for an affected system. To exploit this vulnerability by using SNMPv3, the attacker must know the user credentials for the affected system.

• CWE-118
• CWE-20

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-dos-USxSyTk5Vendor Advisory
• https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-dos-USxSyTk5Vendor Advisory
• https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory

Published

Jun 3, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2020-3229A vulnerability in Role Based Access Control (RBAC) function…8.8
• CVE-2020-3230A vulnerability in the Internet Key Exchange Version 2 (IKEv…7.5
• CVE-2020-3231A vulnerability in the 802.1X feature of Cisco Catalyst 2960…4.7
• CVE-2020-3232A vulnerability in the Simple Network Management Protocol (S…7.7
• CVE-2020-3233A vulnerability in the web-based Local Manager interface of …5.4
• CVE-2020-3234A vulnerability in the virtual console authentication of Cis…8.8
• CVE-2020-3236A vulnerability in the CLI of Cisco Enterprise NFV Infrastru…6.7
• CVE-2020-3237A vulnerability in the Cisco Application Framework component…6.3
• CVE-2020-3238A vulnerability in the Cisco Application Framework component…8.1
• CVE-2020-3239Multiple vulnerabilities in the REST API of Cisco UCS Direct…8.8
• CVE-2020-3240Multiple vulnerabilities in the REST API of Cisco UCS Direct…7.3
• CVE-2020-3241A vulnerability in the orchestration tasks of Cisco UCS Dire…6.5