CVE-2023-31740Public exploitNetwork attack vector

Shell access via apply.cgi parameter injection

Published May 23, 2023 · Updated Jul 9, 2026

Command injection in Linksys E2000 firmware 1.0.06 allows remote authenticated users to gain shell privileges through apply.cgi. The apply.cgi handler processes the WL_atten_bb, WL_atten_radio, and WL_atten_ctl POST parameters without neutralizing injected shell syntax. Administrative web-management privileges are required, after which injected commands execute with the router's shell privileges.

CVSS severity7.2
High
EPSS probability2.37%
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 Linksys E2000 firmware 1.0.06 allows remote authenticated users to gain shell privileges through apply.cgi. The apply.cgi handler processes the WL_atten_bb, WL_atten_radio, and WL_atten_ctl POST parameters without neutralizing injected shell syntax. Administrative web-management privileges are required, after which injected commands execute with the router's shell privileges.

The record

CVE
CVE-2023-31740
Published
May 23, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

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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