CVE-2021-34726

Root command execution via malformed CLI input

Published Sep 23, 2021 · Updated Nov 7, 2024

Command injection in Cisco SD-WAN Software allows local users with administrative access to execute operating-system commands as root. Certain CLI commands fail to validate crafted input before passing it to the underlying operating system; Cisco has not identified the commands or parsing path. An administrative account and local CLI access are required, and successful exploitation grants root-level command execution on the affected device.

CVSS severity6.7
Medium
EPSS probability0.37%
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 SD-WAN Software allows local users with administrative access to execute operating-system commands as root. Certain CLI commands fail to validate crafted input before passing it to the underlying operating system; Cisco has not identified the commands or parsing path. An administrative account and local CLI access are required, and successful exploitation grants root-level command execution on the affected device.

The record

CVE
CVE-2021-34726
Published
Sep 23, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco SD-WAN
Classifications
CWE-77, T1068
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 SD-WANversion=n/a

Published CVSS scores

6.7CiscoCVSS:3.0/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.

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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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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