CVE-2025-20156Network attack vector

Administrator escalation via unauthorized REST API requests

Published Jan 22, 2025 · Updated Feb 26, 2026

Improper authorization in the Cisco Meeting Management REST API before 3.9.1 allows remote authenticated users to gain administrator control. A specific REST API endpoint accepts low-privileged requests without enforcing the authorization required for administrator-level operations. A valid low-privileged account is required; successful exploitation grants control over edge nodes managed by the deployment.

CVSS severity9.9
Critical
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in the Cisco Meeting Management REST API before 3.9.1 allows remote authenticated users to gain administrator control. A specific REST API endpoint accepts low-privileged requests without enforcing the authorization required for administrator-level operations. A valid low-privileged account is required; successful exploitation grants control over edge nodes managed by the deployment.

The record

CVE
CVE-2025-20156
Published
Jan 22, 2025
Updated
Feb 26, 2026
Vendor
ClamAV
Product
Cisco Meeting Management
Classifications
CWE-274, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=CMM2.9.0
  2. Affected versionversion=CMM2.9.1
  3. Affected versionversion=CMM3.1.0
  4. Affected versionversion=CMM3.2.0
  5. Affected versionversion=CMM3.4.0
  6. Affected versionversion=CMM3.5.0
  7. Affected versionversion=CMM3.6.0
  8. Affected versionversion=CMM3.6.1
  9. Affected versionversion=CMM3.7.0
  10. Affected versionversion=CMM3.8.0
  11. Affected versionversion=CMM3.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Meeting Managementversion=CMM2.9.0; version=CMM2.9.1; version=CMM3.1.0; version=CMM3.2.0; version=CMM3.4.0; version=CMM3.5.0; version=CMM3.6.0; version=CMM3.6.1; version=CMM3.7.0; version=CMM3.8.0; version=CMM3.9.0

Published CVSS scores

9.9Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:X

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-274Improper Handling of Insufficient Privileges
T1068Exploitation for Privilege Escalation

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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