CVE-2018-17283: Zoho ManageEngine OpManager before 12.3 Build 123196 does not require authentication for /oputilsServlet requests, as…

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 6 Jan 2024. It cites 76 public reports, the first from 6 Jan 2024.

How likely is exploitation in the next 30 days?

66.3%

EPSS score, percentile 99.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 30 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

Zoho ManageEngine OpManager before 12.3 Build 123196 does not require authentication for /oputilsServlet requests, as demonstrated by a /oputilsServlet?action=getAPIKey request that can be leveraged against Firewall Analyzer to add an admin user via /api/json/v2/admin/addUser or conduct a SQL Injection attack via the /api/json/device/setManaged name parameter.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.