CVE-2017-3861: Cisco IOS

High severity, CVSS 8.6. EPSS: 2.8% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the EnergyWise module of Cisco IOS (12.2 and 15.0 through 15.6) and Cisco IOS XE (3.2 through 3.18) could allow an unauthenticated, remote attacker to cause a buffer overflow condition or a reload of an affected device, leading to a denial of service (DoS) condition. These vulnerabilities are due to improper parsing of crafted EnergyWise packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted EnergyWise packets to be processed by an affected device. An exploit could allow the attacker to cause a buffer overflow condition or a reload of the affected device, leading to a DoS condition. Cisco IOS Software and Cisco IOS XE Software support EnergyWise for IPv4 communication. Only IPv4 packets destined to a device configured as an EnergyWise domain member can trigger these vulnerabilities. IPv6 packets cannot be used to trigger these vulnerabilities. Cisco Bug ID CSCut47751.

Affected products

• Cisco IOS: version 12.2(33)sxi4 only; version 12.2(33)sxi4a only; version 12.2(33)sxi5 only; version 12.2(33)sxi6 only; version 12.2(33)sxi7 only; version 12.2(33)sxi8 only; …
• Cisco IOS XE: version 3.2.1sg only; version 3.2.8sg only; version 3.3.1sg only; version 3.3.1sq only; version 3.4.1sg only; version 3.4.2sg only; …

Published 2017-04-20. Last modified 2026-06-17.