CVE-2021-1421

Root command execution via insufficient configuration input validation

Published May 6, 2021 · Updated Nov 8, 2024

OS command injection in Cisco Enterprise NFV Infrastructure Software before 4.5.1 allows local users to execute commands as root. The affected configuration command insufficiently validates user-supplied input before executing it on the underlying operating system. A non-privileged account authenticated to the restricted CLI is sufficient, and successful exploitation grants full root command execution.

CVSS severity7.8
High
EPSS probability0.67%
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 Enterprise NFV Infrastructure Software before 4.5.1 allows local users to execute commands as root. The affected configuration command insufficiently validates user-supplied input before executing it on the underlying operating system. A non-privileged account authenticated to the restricted CLI is sufficient, and successful exploitation grants full root command execution.

The record

CVE
CVE-2021-1421
Published
May 6, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco Enterprise NFV Infrastructure Software
Classifications
CWE-78, T1059
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 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 vectorlocal
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Enterprise NFV Infrastructure Softwareversion=n/a

Published CVSS scores

7.8CiscoCVSS:3.1/AV:L/AC:L/PR:L/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
Privilegesauthenticated
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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