CVE-2023-33781Public exploitNetwork attack vector

Authenticated command execution via unvalidated restore field

Published Jun 7, 2023 · Updated Jul 9, 2026

Command injection in D-Link DIR-842V2 firmware 1.0.3 and earlier allows remote authenticated users to execute arbitrary commands. The restore handler loads an uploaded configuration without validating the Telnet Shell field, allowing that field to select /bin/sh as the service program. Administrative credentials and a router reboot are required; the modified configuration enables Telnet and yields a root shell without Telnet authentication.

CVSS severity8.8
High
EPSS probability32.03%
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 D-Link DIR-842V2 firmware 1.0.3 and earlier allows remote authenticated users to execute arbitrary commands. The restore handler loads an uploaded configuration without validating the Telnet Shell field, allowing that field to select /bin/sh as the service program. Administrative credentials and a router reboot are required; the modified configuration enables Telnet and yields a root shell without Telnet authentication.

The record

CVE
CVE-2023-33781
Published
Jun 7, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 7, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1059.004Unix 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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