CVE-2021-1506Network attack vector

Authenticated service access via missing authorization checks

Published May 6, 2021 · Updated Nov 8, 2024

Authorization bypass in Cisco Catalyst SD-WAN Manager operating in cluster mode allows remote authenticated users to access protected services. A cluster service accepts crafted requests without checking whether the authenticated requester is authorized for the requested service. High-privilege access is required; successful exploitation grants unauthorized access to internal services and their operations.

CVSS severity7.2
High
EPSS probability1.80%
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 Cisco Catalyst SD-WAN Manager operating in cluster mode allows remote authenticated users to access protected services. A cluster service accepts crafted requests without checking whether the authenticated requester is authorized for the requested service. High-privilege access is required; successful exploitation grants unauthorized access to internal services and their operations.

The record

CVE
CVE-2021-1506
Published
May 6, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco Catalyst SD-WAN Manager
Classifications
CWE-20, CWE-862, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 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=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco Catalyst SD-WAN Managerversion=n/a

Published CVSS scores

7.2Cisco Systems, Inc. vulnerability-specific advisoryCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:S/C:P/I:P/A:P
9.8Cisco Systems, Inc. CNA recordCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-862Missing Authorization
T1190Exploit Public-Facing Application

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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