Exploited CVEs / Cisco / CVE-2016-6366
CVE-2016-6366
Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2022-06-14 (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.
Actively exploited Cisco Adaptive Security Appliance (ASA) vulnerability, High severity, CVSS 8.8. Added to the CISA KEV catalog 2022-05-24.
Risk summary
Updated July 27, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2016-6366
This is the ASA SNMP buffer overflow tied to the leaked Equation Group toolset, allowing remote code execution or a device reload on your perimeter firewall through crafted SNMP packets. Any Cisco ASA reachable via SNMP is exposed, and with an 88 percent EPSS score plus confirmed exploitation in the CISA KEV catalog, attackers have working code for this. A firewall RCE is especially damaging because the device sits at the network edge and often has broad trust.
Do this: Patch affected Cisco ASA software immediately, and until then restrict SNMP access to trusted management hosts only or disable it.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2016-6366
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2016-6366
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.
CISA required action
Federal (BOD 22-01) remediation due date: 2022-06-14 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2016-6366
The authoritative fix and affected-version list are published by the vendor. Find the Adaptive Security Appliance (ASA) advisory on Cisco Security Advisories (PSIRT).
Common questions about CVE-2016-6366
Is CVE-2016-6366 actively exploited?
Yes. CVE-2016-6366 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-05-24, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 88%.
What is the CISA deadline and required action for CVE-2016-6366?
CISA set the federal (BOD 22-01) remediation due date at 2022-06-14, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2016-6366?
The authoritative fix is in the vendor advisory: see Cisco Security Advisories (PSIRT) for the patched Adaptive Security Appliance (ASA) 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-2016-6366?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2016-6366'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 twice a day (5 AM and 3 PM US Central).
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