Exploited CVEs / Cisco / CVE-2021-1498
CVE-2021-1498
Cisco HyperFlex HX Data Platform Command Injection Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2021-11-17 (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 HyperFlex HX vulnerability, Critical severity, CVSS 9.8. 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-2021-1498
This flaw lets an unauthenticated attacker inject commands into the HyperFlex HX Installer Virtual Machine and run them as the tomcat8 user due to insufficient input validation. Anyone running the HyperFlex HX Installer VM is exposed, and with an EPSS score of 100 percent plus confirmed CISA KEV listing since November 2021, exploitation is not theoretical. The tomcat8 foothold gives attackers a foothold on infrastructure that manages your hyperconverged storage cluster.
Do this: Apply Cisco's HyperFlex HX Data Platform update for CVE-2021-1498 to your Installer VM immediately, or take the Installer VM offline until patched since it is not needed for ongoing cluster operation.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2021-1498
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2021-1498
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: 2021-11-17 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2021-1498
The authoritative fix and affected-version list are published by the vendor. Find the HyperFlex HX advisory on Cisco Security Advisories (PSIRT).
Common questions about CVE-2021-1498
Is CVE-2021-1498 actively exploited?
Yes. CVE-2021-1498 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-2021-1498?
CISA set the federal (BOD 22-01) remediation due date at 2021-11-17, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2021-1498?
The authoritative fix is in the vendor advisory: see Cisco Security Advisories (PSIRT) for the patched HyperFlex HX 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-2021-1498?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2021-1498'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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