CVE-2017-6740

Name of the Vulnerable Software and Affected Versions Cisco IOS versions 12.0 through 12.4 and 15.0 through 15.6 Cisco IOS XE versions 2.2 through 3.17

Description 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. 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. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable.

Recommendations For Cisco IOS versions 12.0 through 12.4 and 15.0 through 15.6, apply the workaround as contained in the Workarounds section below and consider updating to a fixed software version available via the Cisco IOS Software Checker. For Cisco IOS XE versions 2.2 through 3.17, apply the workaround as contained in the Workarounds section below and consider updating to a fixed software version available via the Cisco IOS Software Checker. As a temporary workaround, consider disabling the SNMP service on affected devices until a patch is available. Restrict access to the affected MIBs or OIDs to minimize the risk of exploitation.