CVE-2021-1423

File overwrite via insufficient CLI argument validation

Published Mar 24, 2021 · Updated Nov 8, 2024

Improper input validation in a CLI command in Cisco Aironet Access Point Software allows local users to overwrite flash-memory files. An undisclosed CLI command inadequately validates crafted arguments before using data from one device-hosted file to create or overwrite another file in flash memory. Exploitation requires authenticated, high-privilege CLI access and is limited to file integrity; no confidentiality or availability impact is reported.

CVSS severity4.4
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in a CLI command in Cisco Aironet Access Point Software allows local users to overwrite flash-memory files. An undisclosed CLI command inadequately validates crafted arguments before using data from one device-hosted file to create or overwrite another file in flash memory. Exploitation requires authenticated, high-privilege CLI access and is limited to file integrity; no confidentiality or availability impact is reported.

The record

CVE
CVE-2021-1423
Published
Mar 24, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco Aironet Access Point Software
Classifications
CWE-668, T1565.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 24, 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 privilegesadmin

What is affected?

ClamAV · Cisco Aironet Access Point Softwareversion=n/a

Published CVSS scores

4.4Cisco Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X
2.1NVDAV:L/AC:L/Au:N/C:N/I:P/A:N

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-668Exposure of Resource to Wrong Sphere
T1565.001Stored Data Manipulation

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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