CVE-2021-1559Network attack vector

Root command execution via unsanitized command input

Published May 22, 2021 · Updated Nov 8, 2024

OS command injection in Cisco DNA Spaces Connector before 2.0.519 allows remote authenticated users to execute commands as root. The Connector docker component fails to sanitize crafted input before passing it into affected command execution, but Cisco does not identify the command or input field. Exploitation requires a high-privileged account and yields arbitrary command execution as root inside the Connector container, with confidentiality and integrity impact but no reported availability impact.

CVSS severity6.5
Medium
EPSS probability2.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Cisco DNA Spaces Connector before 2.0.519 allows remote authenticated users to execute commands as root. The Connector docker component fails to sanitize crafted input before passing it into affected command execution, but Cisco does not identify the command or input field. Exploitation requires a high-privileged account and yields arbitrary command execution as root inside the Connector container, with confidentiality and integrity impact but no reported availability impact.

The record

CVE
CVE-2021-1559
Published
May 22, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco Spaces: Connector
Classifications
CWE-78, 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 Spaces: Connectorversion=n/a

Published CVSS scores

6.5CiscoCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/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
Privilegesadmin
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.

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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