Is CVE-2017-6742 being actively exploited?

Yes. CVE-2017-6742 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on April 19, 2023.

What is the CVSS score for CVE-2017-6742?

CVE-2017-6742 has a CVSS 3.1 base score of 8.8 (HIGH).

CVE-2017-6742

HIGH · CVSS 8.8CISA KEV: actively exploitedEPSS 21.4%EU EUVD: exploited

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.  The vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary code and obtain full control of the system or to cause a reload of the affected system. Only traffic directed to the affected system can be used to exploit this vulnerability.

Key facts

CVSS score: 8.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-119
EPSS score: 21.4% (98th percentile)
In CISA KEV: Yes, added April 19, 2023
In EU EUVD: Yes (EUVD-2017-15796)
Published: July 17, 2017
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability

Added to the KEV catalog on April 19, 2023; federal remediation due May 10, 2023.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-15796 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on January 12, 2026.

View on the EU Vulnerability Database

Affected products

cisco / ios
cisco / ios xe

Certified products that may be affected

9 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Catalyst 4500 Series Wired Access Switches running IOS-XE 3.10 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-10906-2018 - archived
Cisco Catalyst 3K/4K Wired Access Switches running IOS-XE 3.8.0E - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10688-2016 - archived
Cisco Aggregation Services Router (ASR) 1000 Series, IOS XE 3.13 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10609-2015 - archived
Cisco Integrated Services Router 4400 Series (ISR-4400), IOS XE 3.13.0 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10600-2015 - archived
Cisco Catalyst 3650, 3850, 4500E (Sup7E, Sup7LE, Sup8E), 4500X, 4500XF running IOS-XE 3.6.1S - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10607-2014 - archived

See all 9 in the Security Certifications Explorer.

References

http://www.securityfocus.com/bid/99345(Broken Link, Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1038808(Broken Link, Third Party Advisory, VDB Entry)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp(Vendor Advisory)
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp(Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6742(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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