Exploited CVEs / Cisco / CVE-2017-6739

CVE-2017-6739

Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2022-03-24 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Cisco Security Advisories (PSIRT), linked below.

Risk summary

HighCISA KEV

8.8

CVSS v3 base

11%

EPSS exploit probability

High

Severity

2022-03-03

Added to KEV

2022-03-24 (past due)

CISA due date

Actively exploited Cisco IOS and IOS XE Software vulnerability, High severity, CVSS v3 8.8. Added to the CISA KEV catalog 2022-03-03.

Senserva AI read on CVE-2017-6739 CISA required action Official fix for CVE-2017-6739 Admin questions

Senserva AI Opinion for CVE-2017-6739

This is a memory corruption flaw in the SNMP subsystem of Cisco IOS and IOS XE that lets an authenticated remote attacker run code or force a device reload. It sits in core network gear like routers and switches, so a compromised community string or read credential can turn management traffic into a takeover path. CISA confirmed active exploitation and added it to the KEV catalog in March 2022, and the SNMP attack surface makes this a router-level rather than endpoint concern.

Do this: Restrict SNMP access to trusted management hosts via ACLs, rotate community strings, and apply Cisco's fixed IOS and IOS XE releases on affected devices.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2017-6739

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I run IT security. Facts for CVE-2017-6739, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2017-6739.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed once a day (early morning US Central)):
- CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
- Affected: Cisco IOS and IOS XE Software
- Severity: High, CVSS v3 8.8; EPSS 30-day exploitation probability 11%
- Added to CISA KEV: 2022-03-03; federal remediation due 2022-03-24
- Ransomware-linked: no
- CISA required action: Apply updates per vendor instructions.
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) The fastest safe path to remediation. 4) How to check whether my environment is exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch now

Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.

The fix ships from the vendor: Cisco Security Advisories (PSIRT).

Do this now: Federal remediation deadline 2022-03-24; treat it as your outer bound. Patch now and verify deployment on every exposed device.

Updated September 3, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2017-6739

Published: 2022-03-03
Last revised: 2022-03-03
Changes tracked: 1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

Senserva Watchevery change we have recorded for this one

What changed, and when

2022-03-03 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 8.8; EPSS first scored at 10.5%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

CISA required action

Federal (BOD 22-01) remediation due date: 2022-03-24 (past due).

Apply updates per vendor instructions.

Official fix for CVE-2017-6739

The authoritative fix and affected-version list are published by the vendor. Find the IOS and IOS XE Software advisory on Cisco Security Advisories (PSIRT).

Cisco Security Advisories (PSIRT)CISA KEV entry

Common questions about CVE-2017-6739

Is CVE-2017-6739 actively exploited?

Yes. CVE-2017-6739 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-03-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 11%.

What is the CISA deadline and required action for CVE-2017-6739?

CISA set the federal (BOD 22-01) remediation due date at 2022-03-24, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.

What fixes CVE-2017-6739?

The authoritative fix is in the vendor advisory: see Cisco Security Advisories (PSIRT) for the patched IOS and IOS XE Software versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2017-6739?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2017-6739's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed once a day (early morning US Central).

Scope and sources

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All Cisco exploited CVEs on one page: Cisco vulnerabilities actively exploited.
Authoritative references: CVE record NVD detail CISA KEV catalog FIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.