CVE-2017-6740VulnerabilityPublished 03/03/2022Updated 10/24/2026

CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability

Affects Cisco IOS and IOS XE SoftwareSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/03/2022
KEV deadline: 03/24/2022
EPSS: 11.1% chance of exploitation in 30 days – higher than 95% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2017-6740 (opens in a new tab)

Description

CVE-2017-6740 is a vulnerability in the SNMP subsystem of Cisco IOS and IOS XE software that allows an authenticated remote attacker to execute code or cause the system to reload. It has been exploited in the wild. The vulnerability is classified as high severity due to its potential impact on system availability and control.

Summary

The Simple Network Management Protocol (SNMP) subsystem in Cisco IOS and IOS XE software contains a vulnerability (CVE-2017-6740) that permits an authenticated remote attacker to execute arbitrary code or cause a system reload. This vulnerability has been observed in active exploitation scenarios. No specific affected versions or patch information are provided in the input data.

Impact

An authenticated remote attacker can exploit this vulnerability to execute arbitrary code on the affected device or cause it to reload, potentially disrupting network operations and compromising device integrity. The vulnerability has been exploited in the wild, indicating active threat usage.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor Cisco advisories for updates and apply any recommended patches or mitigations when available.

Weaknesses

CWE-119Buffer Errors (Memory Bounds) (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 10:40:24 UTC

Weaknesses

References

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