CVE-2021-40113Network attack vector

Unauthenticated command injection via crafted web request

Published Nov 4, 2021 · Updated Nov 7, 2024

Command injection in Cisco Catalyst PON Series Switches ONT web interface allows unauthenticated remote attackers to execute arbitrary commands. The interface insufficiently validates user-supplied input in crafted requests, allowing command execution as the root user. Exploitation requires network access to the web management interface; successful attacks can take complete control of the device, while Cisco reports no public malicious use.

CVSS severity10.0
Critical
EPSS probability4.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Cisco Catalyst PON Series Switches ONT web interface allows unauthenticated remote attackers to execute arbitrary commands. The interface insufficiently validates user-supplied input in crafted requests, allowing command execution as the root user. Exploitation requires network access to the web management interface; successful attacks can take complete control of the device, while Cisco reports no public malicious use.

The record

CVE
CVE-2021-40113
Published
Nov 4, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco Catalyst PON Series Switches
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 4, 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 privilegesunauthenticated

What is affected?

ClamAV · Cisco Catalyst PON Series Switchesversion=n/a

Published CVSS scores

10.0CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

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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