CVE-2023-26613Public exploitNetwork attack vector

Unauthenticated command execution via Command1 header

Published Jun 29, 2023 · Updated Nov 27, 2024

OS command injection in D-Link DIR-823G firmware 1.02B05 allows remote attackers to execute arbitrary commands through EXCU_SHELL. The EXCU_SHELL handler reads the Command1 HTTP header and executes its contents when Confirm1 is set to apply, without command neutralization. No authentication or user interaction is required, and successful exploitation grants control of the router operating system.

CVSS severity9.8
Critical
EPSS probability31.40%
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-823G firmware 1.02B05 allows remote attackers to execute arbitrary commands through EXCU_SHELL. The EXCU_SHELL handler reads the Command1 HTTP header and executes its contents when Confirm1 is set to apply, without command neutralization. No authentication or user interaction is required, and successful exploitation grants control of the router operating system.

The record

CVE
CVE-2023-26613
Published
Jun 29, 2023
Updated
Nov 27, 2024
Vendor
D-Link
Product
DIR-823G
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 27, 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=1.02B05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-823Gversion=1.02B05

Published CVSS scores

9.8NIST NVDCVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

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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