Exploited CVEs / Cisco / CVE-2018-0296
CVE-2018-0296
Cisco Adaptive Security Appliance (ASA) Denial-of-Service Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2022-05-03 (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 7.5. Added to the CISA KEV catalog 2021-11-03.
Risk summary
Updated July 27, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2018-0296
This is an improper input validation flaw in the Cisco ASA web interface that lets an unauthenticated attacker send crafted HTTP URLs to crash the device or read parts of its configuration. Any ASA with the WebVPN or web management interface exposed is at risk, and with an EPSS score of 100 percent plus confirmed exploitation in CISA KEV, attackers are actively hitting these boxes. Because ASA firewalls sit at the network edge, a DoS here can take your perimeter offline and information disclosure can leak details that enable follow-on attacks.
Do this: Apply Cisco's fixed ASA software release now, and if you cannot patch immediately restrict access to the WebVPN and web management interfaces to trusted addresses only.
AI-generated from public data, 2026-07-22. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2018-0296
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2018-0296
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: 2022-05-03 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2018-0296
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-2018-0296
Is CVE-2018-0296 actively exploited?
Yes. CVE-2018-0296 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 100%.
What is the CISA deadline and required action for CVE-2018-0296?
CISA set the federal (BOD 22-01) remediation due date at 2022-05-03, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2018-0296?
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-2018-0296?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2018-0296'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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