CVE-2021-34725

Root command execution via insufficient CLI input validation

Published Sep 23, 2021 · Updated Nov 7, 2024

Command injection in the CLI of Cisco IOS XE SD-WAN Software allows local users with administrative access to execute commands as root. Certain CLI commands accept crafted input without sufficient validation, allowing command syntax to reach the underlying operating system. Reachability requires an administrative account and the SD-WAN feature, which is not enabled by default, and successful exploitation grants root-level 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 the CLI of Cisco IOS XE SD-WAN Software allows local users with administrative access to execute commands as root. Certain CLI commands accept crafted input without sufficient validation, allowing command syntax to reach the underlying operating system. Reachability requires an administrative account and the SD-WAN feature, which is not enabled by default, and successful exploitation grants root-level command execution.

The record

CVE
CVE-2021-34725
Published
Sep 23, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco IOS XE SD-WAN Software
Classifications
CWE-78, CWE-77, T1068, T1059
Attack vector
local
Privileges
admin

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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

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
6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1068Exploitation for Privilege Escalation
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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