CVE-2017-6743

What it is

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities. The vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload. Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable. There are workarounds that address these vulnerabilities.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.

In the wild

CISA lists this as exploited in real attacks. Treat as urgent.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2017-03-09 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2017-07-17 21:29 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2022-03-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
4. 2022-03-24 Remediation deadlineCISA's due date for federal agencies to fix it
5. 2026-06-17 01:22 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
• Exploit odds: 10.9% in the next 30 days (EPSS).
• Severity: 8.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-07-17 21:29 UTC

Last modified

2026-06-17 01:22 UTC

Added to CISA KEV

2022-03-03

Exploit probability

10.9% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Analyzed

Affected

• Cisco iOS ≤ 12.4
• Cisco iOS ≤ 15.6
• Cisco iOS Xe ≤ 3.17

Attack profile CVSS 3.1 · 8.8

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2017-6743.md and follow it. Check whether this project is affected by CVE-2017-6743. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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