CVE-2021-1555Network attack vector

Administrator-authenticated root command execution via unvalidated input

Published May 22, 2021 · Updated Nov 8, 2024

Command injection in Cisco Business Wireless Access Point Software allows remote authenticated users to execute arbitrary commands as root. The web management interface fails to validate crafted HTTP request input before passing it into operating-system command processing. Exploitation requires valid device-administrator credentials and grants full command control of the affected access point.

CVSS severity4.7
Medium
EPSS probability1.66%
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 Business Wireless Access Point Software allows remote authenticated users to execute arbitrary commands as root. The web management interface fails to validate crafted HTTP request input before passing it into operating-system command processing. Exploitation requires valid device-administrator credentials and grants full command control of the affected access point.

The record

CVE
CVE-2021-1555
Published
May 22, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco Business Wireless Access Point Software
Classifications
CWE-77, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 22, 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 Business Wireless Access Point Softwareversion=n/a

Published CVSS scores

4.7CiscoCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

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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