Exploited CVEs / Zoho / CVE-2021-44515
CVE-2021-44515
Zoho Desktop Central Authentication Bypass Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2021-12-24 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Zoho ManageEngine Security Advisories, linked below.
Actively exploited Zoho Desktop Central vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2021-12-10.
Risk summary
Updated July 27, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2021-44515
This is an authentication bypass in Zoho Desktop Central that lets an attacker skip login and run arbitrary code on the Desktop Central MSP server, the very system used to manage and push software to endpoints. Because Desktop Central sits at the center of your patching and configuration workflow, a compromise here hands an attacker a path to every managed device. It is confirmed exploited (CISA KEV since 2021-12-10) with an EPSS score of 100 percent, so treat any internet-exposed instance as a live target.
Do this: Locate all Desktop Central MSP servers, apply Zoho's fixed build immediately, and pull the instance off the public internet if it is exposed.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2021-44515
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2021-44515
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: 2021-12-24 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2021-44515
The authoritative fix and affected-version list are published by the vendor. Find the Desktop Central advisory on Zoho ManageEngine Security Advisories.
Common questions about CVE-2021-44515
Is CVE-2021-44515 actively exploited?
Yes. CVE-2021-44515 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2021-12-10, 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-2021-44515?
CISA set the federal (BOD 22-01) remediation due date at 2021-12-24, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2021-44515?
The authoritative fix is in the vendor advisory: see Zoho ManageEngine Security Advisories for the patched Desktop Central 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-2021-44515?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2021-44515'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).
More exploited Zoho CVEs
The newest Zoho entries on the CISA KEV catalog:
All Zoho exploited CVEs on one page: Zoho vulnerabilities actively exploited.
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
