CVE-2021-31531Network attack vector

Server-side request forgery via undisclosed request handling

Published Jun 29, 2021 · Updated May 30, 2025

Server-side request forgery in Zoho ManageEngine ServiceDesk Plus MSP before 10521 allows remote attackers to issue server-originated requests. The vendor and CNA references do not disclose the affected endpoint, parameter, or validation error that permits an attacker-controlled destination. Unauthenticated network access is sufficient; documented impact is limited to SSRF because accessible resources and response exposure remain undisclosed.

CVSS severity9.8
Critical
EPSS probability2.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Zoho ManageEngine ServiceDesk Plus MSP before 10521 allows remote attackers to issue server-originated requests. The vendor and CNA references do not disclose the affected endpoint, parameter, or validation error that permits an attacker-controlled destination. Unauthenticated network access is sufficient; documented impact is limited to SSRF because accessible resources and response exposure remain undisclosed.

The record

CVE
CVE-2021-31531
Published
Jun 29, 2021
Updated
May 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2021CVE publishedPublication date reported by the CVE source.
  2. May 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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