What is CVE-2017-6742?
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.
The record classifies CVE-2017-6742 under weakness class CWE-119. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 3390 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 21.4% probability of exploitation in the next 30 days, higher than 97.5% of all scored CVEs
- CISA KEV
- Listed since 2023-04-19, federal remediation deadline 2023-05-10
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2017-07-17, last modified 2026-01-12
Is CVE-2017-6742 being exploited?
CISA added CVE-2017-6742 to the Known Exploited Vulnerabilities catalog on 2023-04-19, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-05-10 under BOD 22-01. Weaponised exploit code for CVE-2017-6742 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 47 in the Threadlinqs vulnerability feed.
Affected products and versions
- Cisco: Ios, Ios Xe
How to fix CVE-2017-6742
Vendor advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp. Because CVE-2017-6742 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-05-10. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2017-6742
1 tracked threat in the Threadlinqs corpus references CVE-2017-6742, either in the campaign’s CVE list or as an indicator on the campaign record.
- APT28 Router DNS Hijacking for Adversary-in-the-Middle Credential Theft — HIGH · 2026-04-07
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, public proof-of-concept repositories. Last verified by Threadlinqs on .