A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges. The Cluster Management Protocol utilizes Telnet internally as a signaling and command protocol between cluster members. The vulnerability is due to the combination of two factors: (1) the failure to restrict the use of CMP-specific Telnet options only to internal, local communications between cluster members and instead accept and process such options over any Telnet connection to an affected device; and (2) the incorrect processing of malformed CMP-specific Telnet options. An attacker could exploit this vulnerability by sending malformed CMP-specific Telnet options while establishing a Telnet session with an affected Cisco device configured to accept Telnet connections. An exploit could allow an attacker to execute arbitrary code and obtain full control of the device or cause a reload of the affected device. This affects Catalyst switches, Embedded Service 2020 switches, Enhanced Layer 2 EtherSwitch Service Module, Enhanced Layer 2/3 EtherSwitch Service Module, Gigabit Ethernet Switch Module (CGESM) for HP, IE Industrial Ethernet switches, ME 4924-10GE switch, RF Gateway 10, and SM-X Layer 2/3 EtherSwitch Service Module. Cisco Bug IDs: CSCvd48893.
Published 2017-03-17 22:59:01
Updated 2020-08-07 20:08:15
View at NVD,   CVE.org
Vulnerability category: Input validationExecute code

CVE-2017-3881 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:
Cisco IOS and IOS XE Remote Code Execution Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges.
Added on 2022-03-25 Action due date 2022-04-15

Exploit prediction scoring system (EPSS) score for CVE-2017-3881

Probability of exploitation activity in the next 30 days: 97.45%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 100 % EPSS Score History EPSS FAQ

Metasploit modules for CVE-2017-3881

  • Cisco IOS Telnet Denial of Service
    Disclosure Date: 2017-03-17
    First seen: 2020-04-26
    auxiliary/dos/cisco/ios_telnet_rocem
    This module triggers a Denial of Service condition in the Cisco IOS telnet service affecting multiple Cisco switches. Tested against Cisco Catalyst 2960 and 3750. Authors: - Artem Kondratenko

CVSS scores for CVE-2017-3881

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
10.0
HIGH AV:N/AC:L/Au:N/C:C/I:C/A:C
10.0
10.0
nvd@nist.gov
9.8
CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
nvd@nist.gov

CWE ids for CVE-2017-3881

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-3881

Products affected by CVE-2017-3881

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