CVE-2021-1562Network attack vector

Unauthorized call distribution via XSI command authorization

Published Jul 8, 2021 · Updated Nov 7, 2024

Improper authorization in Cisco BroadWorks Application Server allows remote authenticated users to receive unauthorized Call Center calls. The XSI-Actions interface improperly validates and authorizes a specific command sequence, allowing a user to join a Call Center instance without permission. A valid account and network access to the interface are required; successful exploitation routes queued calls and their sensitive content to the attacker.

CVSS severity4.3
Medium
EPSS probability0.87%
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 Cisco BroadWorks Application Server allows remote authenticated users to receive unauthorized Call Center calls. The XSI-Actions interface improperly validates and authorizes a specific command sequence, allowing a user to join a Call Center instance without permission. A valid account and network access to the interface are required; successful exploitation routes queued calls and their sensitive content to the attacker.

The record

CVE
CVE-2021-1562
Published
Jul 8, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco BroadWorks
Classifications
CWE-20, CWE-200
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 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 privilegesauthenticated

What is affected?

ClamAV · Cisco BroadWorksversion=n/a

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.3Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/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-20Improper Input Validation
CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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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