---
id: "CVE-2018-0161"
kind: "vulnerability"
aliases: ["CVE-2018-0161"]
title: "Cisco IOS Software: Cisco IOS Software Resource Management Errors Vulnerability"
severity: "medium"
cvss: 6.3
epss: 0.04116
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Cisco IOS Software", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["catalyst", "cisco", "exploited", "infrastructure", "ios", "snmp"]
not_affected_if: ["non-catalyst-models", "snmp-disabled"]
published_at: "2018-03-28T22:29:00+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-0161", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2018-0161", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-0161", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Cisco IOS Software: Cisco IOS Software Resource Management Errors Vulnerability

A flaw in the SNMP subsystem of Cisco IOS Software on certain Catalyst switches lets an authenticated remote attacker cause a denial of service. The sources say it is in CISA's known-exploited list, but they do not describe the exploit.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Cisco IOS Software affected ? fixed ?

## Fix

Apply the updates per vendor instructions (CISA required action). The fixed version is unknown from the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-0161
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2018-0161
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2018-0161

## From the sources

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could allow an authenticated, remote attacker to cause a denial of service (DoS) condition, aka a GET MIB Object ID Denial of Service Vulnerability. The vulnerability is due to a condition that could occur when the affected software processes an SNMP read request that contains a request for the ciscoFlashMIB object ID (OID). An attacker could trigger this vulnerability by issuing an SNMP GET request for the ciscoFlashMIB OID on an affected device. A successful exploit could cause the affected device to restart due to a SYS-3-CPUHOG. This vulnerability affects the following Cisco devices if they are running a vulnerable release of Cisco IOS Software and are configured to use SNMP Version 2 (SNMPv2) or SNMP Version 3 (SNMPv3): Cisco Catalyst 2960-L Series Switches, Cisco Catalyst Digital Building Series Switches 8P, Cisco Catalyst Digital Building Series Switches 8U. Cisco Bug IDs: CSCvd89541.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_