CVE-2021-32747Network attack vector

Authenticated secret disclosure via undocumented column parameter

Published Jul 12, 2021 · Updated Aug 3, 2024

Information disclosure in Icinga Web 2 2.0.0 through 2.8.2 allows remote authenticated users to read protected custom variables. The host and service list routes honor the addColumns query parameter during UI, JSON, and CSV output but skip configured protection rules and blacklists. Exploitation requires a logged-in account that can access the affected hosts or services, and exposure is limited to custom-variable values reachable through those objects.

CVSS severity5.3
Medium
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Icinga Web 2 2.0.0 through 2.8.2 allows remote authenticated users to read protected custom variables. The host and service list routes honor the addColumns query parameter during UI, JSON, and CSV output but skip configured protection rules and blacklists. Exploitation requires a logged-in account that can access the affected hosts or services, and exposure is limited to custom-variable values reachable through those objects.

The record

CVE
CVE-2021-32747
Published
Jul 12, 2021
Updated
Aug 3, 2024
Vendor
Icinga
Product
Icinga Web 2
Classifications
CWE-200, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.0.0, <= 2.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Icinga · Icinga Web 2version=>= 2.0.0, <= 2.8.2

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
5.3GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

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

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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