---
id: "CVE-2021-37415"
kind: "vulnerability"
aliases: ["CVE-2021-37415"]
title: "Zoho ManageEngine ServiceDesk Plus (SDP): Zoho ManageEngine ServiceDesk Authentication Bypass Vulnerability"
severity: "critical"
cvss: 9.8
epss: 0.99825
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Zoho ManageEngine ServiceDesk Plus (SDP)", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "manageengine", "self-hosted", "servicedesk-plus", "vendor"]
not_affected_if: ["already-patched-build", "managed-hosting"]
published_at: "2021-09-01T06:15:06+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-37415", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-37415", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-37415", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Zoho ManageEngine ServiceDesk Plus (SDP): Zoho ManageEngine ServiceDesk Authentication Bypass Vulnerability

Zoho ManageEngine ServiceDesk Plus before build 11302 has an authentication bypass that lets a few REST API URLs be reached without logging in. Attackers are exploiting it in the wild, per CISA's Known Exploited Vulnerabilities catalog.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Zoho ManageEngine ServiceDesk Plus (SDP) affected ? fixed ?

## How to check

Check the installed ServiceDesk Plus build number against 11302; anything lower is affected.

## Fix

Upgrade ServiceDesk Plus to build 11302 or later, following Zoho's vendor instructions as CISA requires.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-37415
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-37415
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-37415

## From the sources

Zoho ManageEngine ServiceDesk Plus before 11302 is vulnerable to authentication bypass that allows a few REST-API URLs without authentication

CISA required action: Apply updates per vendor instructions.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_