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CVE REMEDIATION GUIDE
CISA KEV · Known exploitedHighResearch in progress

CVE-2017-6738 remediation guide

Cisco IOS and IOS XE Software

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...

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Research in progress

A verified fixed-version field is not available. Use the linked NVD and supporting references, then confirm the vendor-supported path before changing production systems.

ProductCisco IOS and IOS XE Software
Affected versions12.2(53)SE1, 12.2(55)SE, 12.2(50)SE2, 12.2(50)SE1, 12.2(50)SE5, 12.2(53)SE, 12.2(55)SE3, 12.2(55)SE2, 12.2(52)SE, 12.2(58)SE, 12.2(50)SE3, 12.2(55)SE1, 12.2(53)SE2, 12.2(52)SE1, 12.2(54)SE, 12.2(50)SE4, 12.2(50)SE, 12.2(58)SE1, 12.2(55)SE4, 12.2(58)SE2
Fixed versionsNo verified fixed-version field is available yet
Priority basisImmediate · CVSS 8.8 · EPSS 10.5%
01

Identify the affected asset

Confirm whether Cisco IOS and IOS XE Software is installed, record the deployed version and installation path, and identify exposed interfaces.

  • Record the product name, package or appliance identifier, and installed version.
  • Identify internet-facing, administrative, API, and internal access paths.
  • Preserve the pre-change configuration and relevant service logs.
02

Validate the affected-version match

Compare the deployed version with the affected range: 12.2(53)SE1, 12.2(55)SE, 12.2(50)SE2, 12.2(50)SE1, 12.2(50)SE5, 12.2(53)SE, 12.2(55)SE3, 12.2(55)SE2, 12.2(52)SE, 12.2(58)SE, 12.2(50)SE3, 12.2(55)SE1, 12.2(53)SE2, 12.2(52)SE1, 12.2(54)SE, 12.2(50)SE4, 12.2(50)SE, 12.2(58)SE1, 12.2(55)SE4, 12.2(58)SE2. Treat incomplete inventory results as unresolved.

03

Prioritize with independent signals

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

04

Apply supported remediation

Apply updates per vendor instructions.

05

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

  • Confirm the expected version and package state.
  • Run a functional health check for critical service paths.
  • Review authentication, error, application, and security monitoring logs.
  • Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.