CVE-2021-37927Network attack vector

Account takeover via SSO signature stripping

Published Sep 22, 2021 · Updated Aug 4, 2024

Improper signature verification in Zoho ManageEngine ADManager Plus 7110 and earlier allows remote attackers to take over accounts through SSO. The SSO handler accepts an authentication assertion after its cryptographic signature is stripped, allowing attacker-controlled identity data to pass validation. SSO must be enabled and reachable; successful exploitation grants access as the identity named in the unsigned assertion.

CVSS severity9.8
Critical
EPSS probability2.24%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in Zoho ManageEngine ADManager Plus 7110 and earlier allows remote attackers to take over accounts through SSO. The SSO handler accepts an authentication assertion after its cryptographic signature is stripped, allowing attacker-controlled identity data to pass validation. SSO must be enabled and reachable; successful exploitation grants access as the identity named in the unsigned assertion.

The record

CVE
CVE-2021-37927
Published
Sep 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-347, T1606.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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

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

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1606.002Forge Web Credentials: SAML Tokens

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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