---
id: "CVE-2017-6742"
kind: "vulnerability"
aliases: ["CVE-2017-6742"]
title: "A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the\u2026"
severity: "critical"
cvss: 9.0
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Cisco IOS and IOS XE Software", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "cisco ios", "fixed": [], "affected": ">= 12.0, <= 12.4", "ecosystem": "vendor"}, {"name": "cisco ios", "fixed": [], "affected": ">= 15.0, <= 15.6", "ecosystem": "vendor"}, {"name": "cisco ios xe", "fixed": [], "affected": ">= 2.2.0, <= 3.17", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["cisco", "exploited", "infrastructure", "ios", "ios-xe", "network-gear", "snmp"]
not_affected_if: ["auth-required", "snmp-disabled"]
published_at: "2017-07-17T21:29:00+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-6742", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-6742", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the…

Cisco IOS and IOS XE contain a flaw in the SNMP subsystem that lets a remote attacker run code on the device or force it to reload. CISA lists it as actively exploited.

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

## Affected

- vendor:Cisco IOS and IOS XE Software affected ? fixed ?
- vendor:cisco ios affected >= 12.0, <= 12.4 fixed ?
- vendor:cisco ios affected >= 15.0, <= 15.6 fixed ?
- vendor:cisco ios xe affected >= 2.2.0, <= 3.17 fixed ?

## Fix

Apply the vendor update per Cisco's advisory; 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-2017-6742
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2017-6742

## From the sources

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.&nbsp;



The vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary code and obtain full control of the system or to cause a reload of the affected system.



Only traffic directed to the affected system can be used to exploit this vulnerability.

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