CVE-2023-39665Network attack vector

Post-authentication memory corruption via unchecked query copy

Published Aug 18, 2023 · Updated Oct 7, 2024

A stack-based buffer overflow in D-Link DIR-868L firmware 1.12 allows remote authenticated users to corrupt memory via an HTTP query field. The scandir.sgi binary parses the acStack_50 query parameter and copies user-supplied data into a fixed-length stack buffer without validating its length. Authenticated access to the HTTP management interface is required; D-Link has not published whether corruption causes a crash or code execution.

CVSS severity9.8
Critical
EPSS probability1.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A stack-based buffer overflow in D-Link DIR-868L firmware 1.12 allows remote authenticated users to corrupt memory via an HTTP query field. The scandir.sgi binary parses the acStack_50 query parameter and copies user-supplied data into a fixed-length stack buffer without validating its length. Authenticated access to the HTTP management interface is required; D-Link has not published whether corruption causes a crash or code execution.

The record

CVE
CVE-2023-39665
Published
Aug 18, 2023
Updated
Oct 7, 2024
Vendor
D-Link
Product
DIR-868L
Classifications
CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=fw_revA_1-12_eu_multi_20170316

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DIR-868Lversion=fw_revA_1-12_eu_multi_20170316

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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo