CVE-2023-36089Network attack vector

Unauthenticated privilege escalation via phpcgi_main

Published Jul 31, 2023 · Updated Oct 22, 2024

Authentication bypass in D-Link DIR-645 firmware 1.03 allows remote attackers to gain escalated privileges through its CGI handler. The record localizes the flaw to phpcgi_main in cgibin but does not disclose which authorization decision the function omits or performs incorrectly. No authentication or user interaction is required, and successful exploitation grants higher-privileged control on an end-of-life router.

CVSS severity9.8
Critical
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in D-Link DIR-645 firmware 1.03 allows remote attackers to gain escalated privileges through its CGI handler. The record localizes the flaw to phpcgi_main in cgibin but does not disclose which authorization decision the function omits or performs incorrectly. No authentication or user interaction is required, and successful exploitation grants higher-privileged control on an end-of-life router.

The record

CVE
CVE-2023-36089
Published
Jul 31, 2023
Updated
Oct 22, 2024
Vendor
D-Link
Product
DIR-645
Classifications
CWE-863, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=1.03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-645version=1.03

Published CVSS scores

9.8NVDCVSS: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

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

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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