ExploitedIn CISA KEV

CVE-2017-6742

Exploitation confirmed. First attested on 2023-04-19 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2017-07-17
WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2017-07-1721:29CVE publishedNVD
2023-04-19Listed as exploited by GCVEGCVE
2023-04-19Exploitation first reportedCISA KEV
2023-04-19Added to the CISA KEV catalogCISA KEV
2024-11-0817:35SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-6742?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-6742?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco ios

Branch	Affected	Fixed in	Source
12.x	≥ 12.0, ≤ 12.4	no fix published	NVD
15.x	≥ 15.0, ≤ 15.6	no fix published	NVD

Cisco ios xe

Branch	Affected	Fixed in	Source
3.17	≥ 2.2.0, ≤ 3.17	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s required action: Apply updates per vendor instructions.due 2023-05-10

Advisories and patches

sec.cloudapps.cisco.comVendor Advisory
tools.cisco.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedsastraadiwiguna-purpleeliteteaming/Cisco-IOS-Exploitation-JAGUAR_TOOTH-CVE-2017-6742-Reconstruction

CISA Known Exploited Vulnerability

Date Added: 2023-04-19
Patch Due Date: 2023-05-10
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2023-04-19
GCVEexploitation2023-04-19
CISA-ADPSSVC decisionactive2024-11-08
OpenCVESSVC decisionactive—
NVDCVSS 3.18.8read 2026-10-23
CNACVSS 3.08.8read 2026-10-23
NVDCVSS 2.09read 2026-10-23
CISA-ADPweakness (CWE)CWE-1192024-11-08
NVDweakness (CWE)CWE-119read 2026-10-23
FIRST EPSSEPSS score21.4 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2017-07-17
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-6742?

Is CVE-2017-6742 actively exploited?

Yes. CVE-2017-6742 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-05-10.

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

CVE-2017-6742 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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