Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2020-3235 — cisco / ios

Improper Input Validation

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.

  • Published: Jun 3, 2020
  • Updated: Nov 16, 2025
  • CVE: CVE-2020-3235
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.7
  • AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 6.3
  • AV:N/AC:M/Au:S/C:N/I:N/A:C
Software From Fixed in
cisco / ios 12.2(52)sg 12.2(52)sg.x
cisco / ios 12.2(53)sg1 12.2(53)sg1.x
cisco / ios 12.2(53)sg2 12.2(53)sg2.x
cisco / ios 12.2(53)sg3 12.2(53)sg3.x
cisco / ios 12.2(53)sg4 12.2(53)sg4.x
cisco / ios 12.2(53)sg5 12.2(53)sg5.x
cisco / ios 12.2(53)sg6 12.2(53)sg6.x
cisco / ios 12.2(53)sg7 12.2(53)sg7.x
cisco / ios 12.2(53)sg8 12.2(53)sg8.x
cisco / ios 12.2(53)sg9 12.2(53)sg9.x
cisco / ios 12.2(53)sg10 12.2(53)sg10.x
cisco / ios 12.2(53)sg11 12.2(53)sg11.x
cisco / ios 12.2(54)sg 12.2(54)sg.x
cisco / ios 12.2(54)sg1 12.2(54)sg1.x
cisco / ios 12.2(54)wo 12.2(54)wo.x
cisco / ios 15.0(1)ey 15.0(1)ey.x
cisco / ios 15.0(1)ey2 15.0(1)ey2.x
cisco / ios 15.0(1)xo 15.0(1)xo.x
cisco / ios 15.0(1)xo1 15.0(1)xo1.x
cisco / ios 15.0(2)ex2 15.0(2)ex2.x
cisco / ios 15.0(2)ex8 15.0(2)ex8.x
cisco / ios 15.0(2)sg 15.0(2)sg.x
cisco / ios 15.0(2)sg1 15.0(2)sg1.x
cisco / ios 15.0(2)sg2 15.0(2)sg2.x
cisco / ios 15.0(2)sg3 15.0(2)sg3.x
cisco / ios 15.0(2)sg4 15.0(2)sg4.x
cisco / ios 15.0(2)sg5 15.0(2)sg5.x
cisco / ios 15.0(2)sg6 15.0(2)sg6.x
cisco / ios 15.0(2)sg7 15.0(2)sg7.x
cisco / ios 15.0(2)sg8 15.0(2)sg8.x
cisco / ios 15.0(2)sg9 15.0(2)sg9.x
cisco / ios 15.0(2)sg10 15.0(2)sg10.x
cisco / ios 15.0(2)sg11 15.0(2)sg11.x
cisco / ios 15.0(2)xo 15.0(2)xo.x
cisco / ios 15.1(1)sg 15.1(1)sg.x
cisco / ios 15.1(1)sg1 15.1(1)sg1.x
cisco / ios 15.1(1)sg2 15.1(1)sg2.x
cisco / ios 15.1(2)sg 15.1(2)sg.x
cisco / ios 15.1(2)sg1 15.1(2)sg1.x
cisco / ios 15.1(2)sg2 15.1(2)sg2.x
cisco / ios 15.1(2)sg3 15.1(2)sg3.x
cisco / ios 15.1(2)sg4 15.1(2)sg4.x
cisco / ios 15.1(2)sg5 15.1(2)sg5.x
cisco / ios 15.1(2)sg6 15.1(2)sg6.x
cisco / ios 15.1(2)sg7 15.1(2)sg7.x
cisco / ios 15.1(2)sg8 15.1(2)sg8.x
cisco / ios 15.2(1)e 15.2(1)e.x
cisco / ios 15.2(1)e1 15.2(1)e1.x
cisco / ios 15.2(1)e3 15.2(1)e3.x
cisco / ios 15.2(2)e 15.2(2)e.x
cisco / ios 15.2(2)e1 15.2(2)e1.x
cisco / ios 15.2(2)e2 15.2(2)e2.x
cisco / ios 15.2(2)e3 15.2(2)e3.x
cisco / ios 15.2(2)e4 15.2(2)e4.x
cisco / ios 15.2(2)e5 15.2(2)e5.x
cisco / ios 15.2(2)e5a 15.2(2)e5a.x
cisco / ios 15.2(2)e5b 15.2(2)e5b.x
cisco / ios 15.2(2)e6 15.2(2)e6.x
cisco / ios 15.2(2)e7 15.2(2)e7.x
cisco / ios 15.2(2)e7b 15.2(2)e7b.x
cisco / ios 15.2(2)e8 15.2(2)e8.x
cisco / ios 15.2(2)e9 15.2(2)e9.x
cisco / ios 15.2(2)e9a 15.2(2)e9a.x
cisco / ios 15.2(2)e10 15.2(2)e10.x
cisco / ios 15.2(2b)e 15.2(2b)e.x
cisco / ios 15.2(3)e 15.2(3)e.x
cisco / ios 15.2(3)e1 15.2(3)e1.x
cisco / ios 15.2(3)e2 15.2(3)e2.x
cisco / ios 15.2(3)e3 15.2(3)e3.x
cisco / ios 15.2(3)e4 15.2(3)e4.x
cisco / ios 15.2(3)e5 15.2(3)e5.x
cisco / ios 15.2(4)e 15.2(4)e.x
cisco / ios 15.2(4)e1 15.2(4)e1.x
cisco / ios 15.2(4)e2 15.2(4)e2.x
cisco / ios 15.2(4)e3 15.2(4)e3.x
cisco / ios 15.2(4)e4 15.2(4)e4.x
cisco / ios 15.2(4)e5 15.2(4)e5.x
cisco / ios 15.2(4)e5a 15.2(4)e5a.x
cisco / ios 15.2(4)e6 15.2(4)e6.x
cisco / ios 15.2(4)e7 15.2(4)e7.x
cisco / ios 15.2(4)e8 15.2(4)e8.x
cisco / ios 15.3(3)jpj 15.3(3)jpj.x
cisco / ios_xe 3.2.0sg 3.2.0sg.x
cisco / ios_xe 3.2.1sg 3.2.1sg.x
cisco / ios_xe 3.2.2sg 3.2.2sg.x
cisco / ios_xe 3.2.3sg 3.2.3sg.x
cisco / ios_xe 3.2.4sg 3.2.4sg.x
cisco / ios_xe 3.2.5sg 3.2.5sg.x
cisco / ios_xe 3.2.6sg 3.2.6sg.x
cisco / ios_xe 3.2.7sg 3.2.7sg.x
cisco / ios_xe 3.2.8sg 3.2.8sg.x
cisco / ios_xe 3.2.9sg 3.2.9sg.x
cisco / ios_xe 3.2.10sg 3.2.10sg.x
cisco / ios_xe 3.2.11sg 3.2.11sg.x
cisco / ios_xe 3.3.0sg 3.3.0sg.x
cisco / ios_xe 3.3.0xo 3.3.0xo.x
cisco / ios_xe 3.3.1sg 3.3.1sg.x
cisco / ios_xe 3.3.1xo 3.3.1xo.x
cisco / ios_xe 3.3.2sg 3.3.2sg.x
cisco / ios_xe 3.3.2xo 3.3.2xo.x
cisco / ios_xe 3.4.0sg 3.4.0sg.x
cisco / ios_xe 3.4.1sg 3.4.1sg.x
cisco / ios_xe 3.4.2sg 3.4.2sg.x
cisco / ios_xe 3.4.3sg 3.4.3sg.x
cisco / ios_xe 3.4.4sg 3.4.4sg.x
cisco / ios_xe 3.4.5sg 3.4.5sg.x
cisco / ios_xe 3.4.6sg 3.4.6sg.x
cisco / ios_xe 3.4.7sg 3.4.7sg.x
cisco / ios_xe 3.4.8sg 3.4.8sg.x
cisco / ios_xe 3.5.0e 3.5.0e.x
cisco / ios_xe 3.5.1e 3.5.1e.x
cisco / ios_xe 3.5.2e 3.5.2e.x
cisco / ios_xe 3.5.3e 3.5.3e.x
cisco / ios_xe 3.6.0be 3.6.0be.x
cisco / ios_xe 3.6.0e 3.6.0e.x
cisco / ios_xe 3.6.1e 3.6.1e.x
cisco / ios_xe 3.6.3e 3.6.3e.x
cisco / ios_xe 3.6.4e 3.6.4e.x
cisco / ios_xe 3.6.5ae 3.6.5ae.x
cisco / ios_xe 3.6.5be 3.6.5be.x
cisco / ios_xe 3.6.5e 3.6.5e.x
cisco / ios_xe 3.6.6e 3.6.6e.x
cisco / ios_xe 3.6.7e 3.6.7e.x
cisco / ios_xe 3.6.8e 3.6.8e.x
cisco / ios_xe 3.6.9e 3.6.9e.x
cisco / ios_xe 3.6.10e 3.6.10e.x
cisco / ios_xe 3.7.0e 3.7.0e.x
cisco / ios_xe 3.7.1e 3.7.1e.x
cisco / ios_xe 3.7.2e 3.7.2e.x
cisco / ios_xe 3.7.3e 3.7.3e.x
cisco / ios_xe 3.8.0e 3.8.0e.x
cisco / ios_xe 3.8.1e 3.8.1e.x
cisco / ios_xe 3.8.2e 3.8.2e.x
cisco / ios_xe 3.8.3e 3.8.3e.x
cisco / ios_xe 3.8.4e 3.8.4e.x
cisco / ios_xe 3.8.5ae 3.8.5ae.x
cisco / ios_xe 3.8.5e 3.8.5e.x
cisco / ios_xe 3.8.6e 3.8.6e.x
cisco / ios_xe 3.8.7e 3.8.7e.x
cisco / ios_xe 3.8.8e 3.8.8e.x
cisco / ios_xe 3.9.0e 3.9.0e.x
cisco / ios_xe 3.9.1e 3.9.1e.x
cisco / ios_xe 3.9.2be 3.9.2be.x
cisco / ios_xe 3.9.2e 3.9.2e.x
cisco / ios_xe 3.10.0ce 3.10.0ce.x
cisco / ios_xe 3.10.0e 3.10.0e.x
cisco / ios_xe 3.10.1ae 3.10.1ae.x
cisco / ios_xe 3.10.1e 3.10.1e.x
cisco / ios_xe 3.10.1se 3.10.1se.x
cisco / ios_xe 3.10.2e 3.10.2e.x
oracle / goldengate_management_pack 12.2.1.2.0 12.2.1.2.0.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.