CVE-2021-27900Network attack vector

View-only configuration tampering via missing Web Console authorization

Published Apr 6, 2021 · Updated Aug 3, 2024

Authorization bypass in Proofpoint Insider Threat Management Server before 7.11.1 allows remote authenticated users to alter settings. Several Web Console pages omit authorization checks and accept configuration changes or agent-deletion requests from view-only accounts. A view-only account and network access to the console are required; successful exploitation can rewrite any configuration setting or delete any registered agent.

CVSS severity8.1
High
EPSS probability2.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Proofpoint Insider Threat Management Server before 7.11.1 allows remote authenticated users to alter settings. Several Web Console pages omit authorization checks and accept configuration changes or agent-deletion requests from view-only accounts. A view-only account and network access to the console are required; successful exploitation can rewrite any configuration setting or delete any registered agent.

The record

CVE
CVE-2021-27900
Published
Apr 6, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1562.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1ProofpointCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1562.001Impair Defenses: Disable or Modify Tools

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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