CVE-2021-27904

Information disclosure via cross-server all-orgs lookup

Published Mar 2, 2021 · Updated Aug 3, 2024

Information disclosure in MISP 2.4.139 and earlier allows local users to view sharing-group objects intended for other organizations. SharingGroupServer::checkIfAuthorised accepts any matching all_orgs row without restricting server_id to the local server, so a remote server flag grants local visibility. A low-privileged MISP account in an unintended local organization is required, and exposure is limited to viewing the affected sharing-group object.

CVSS severity5.5
Medium
EPSS probability0.26%
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 MISP 2.4.139 and earlier allows local users to view sharing-group objects intended for other organizations. SharingGroupServer::checkIfAuthorised accepts any matching all_orgs row without restricting server_id to the local server, so a remote server flag grants local visibility. A low-privileged MISP account in an unintended local organization is required, and exposure is limited to viewing the affected sharing-group object.

The record

CVE
CVE-2021-27904
Published
Mar 2, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1213
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/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.

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No observations available

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

Weakness, pattern, technique

T1213Data from Information Repositories

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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