CVE-2021-34729

Elevated command execution via unvalidated CLI arguments

Published Sep 23, 2021 · Updated Nov 7, 2024

Command injection in Cisco IOS XE SD-WAN Software allows local users to execute arbitrary commands with elevated privileges via the CLI. Certain CLI commands insufficiently validate attacker-controlled arguments before passing them to the underlying operating system. Valid high-privilege device credentials and Controller mode are required, and successful exploitation grants operating-system command execution.

CVSS severity6.7
Medium
EPSS probability0.36%
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 IOS XE SD-WAN Software allows local users to execute arbitrary commands with elevated privileges via the CLI. Certain CLI commands insufficiently validate attacker-controlled arguments before passing them to the underlying operating system. Valid high-privilege device credentials and Controller mode are required, and successful exploitation grants operating-system command execution.

The record

CVE
CVE-2021-34729
Published
Sep 23, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco IOS XE SD-WAN Software
Classifications
CWE-77, T1059
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ClamAV · Cisco IOS XE SD-WAN Softwareversion=n/a

Published CVSS scores

6.7Cisco Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/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)
Vectorlocal
Privilegesauthenticated
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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