Threat Intelligence / CVE / CVE-2017-6742

CVE-2017-6742 — Cisco Ios

CISA KEV

CVSS v3.1 8.8 (HIGH) · EPSS 6.7% (higher than 91.3% of all scored CVEs) · Priority 9/10 · Published 2017-07-17

As of 2026-01-12, CVE-2017-6742 is a HIGH-severity vulnerability in Cisco Ios, CVSS v3.1 8.8, EPSS 6.7% (91.3th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-04-19), with a US federal remediation deadline of 2023-05-10. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2017-6742, most recently “APT28 Router DNS Hijacking for Adversary-in-the-Middle Credential Theft”.

Last updated: 2026-01-12

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.&nbsp 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 3345 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): 6.7% probability of exploitation in the next 30 days, higher than 91.3% 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. It currently carries a trending score of 38 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

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2017-6742 are available via the Threadlinqs MCP server (Purple tier). View plans →

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