CVE-2023-25279Public exploitNetwork attack vector

Root command execution via email-setting filter bypass

Published Mar 13, 2023 · Updated Mar 3, 2025

OS command injection in D-Link DIR-820L firmware 1.05B03 allows remote attackers to execute arbitrary commands as root through email settings. The /sbin/ncc2 sub_5129BC function concatenates four /tools_email.asp request fields into a system command, while hasInjectionString fails to reject line feeds and dollar signs. Network access to the web management interface and a crafted settings POST are required; successful injection yields a root shell and full device control.

CVSS severity9.8
Critical
EPSS probability30.99%
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 D-Link DIR-820L firmware 1.05B03 allows remote attackers to execute arbitrary commands as root through email settings. The /sbin/ncc2 sub_5129BC function concatenates four /tools_email.asp request fields into a system command, while hasInjectionString fails to reject line feeds and dollar signs. Network access to the web management interface and a crafted settings POST are required; successful injection yields a root shell and full device control.

The record

CVE
CVE-2023-25279
Published
Mar 13, 2023
Updated
Mar 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2025Record 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS 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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