CVE-2023-29856Network attack vector

Authenticated memory corruption via unchecked HTTP query length

Published May 2, 2023 · Updated Aug 2, 2024

Stack buffer overflow in D-Link DIR-868L A1 firmware 1.12 allows remote authenticated users to corrupt memory through an HTTP request. The scandir.sgi binary copies a user-supplied HTTP query value into a fixed-length stack buffer without first validating its length. Authentication and network access to the HTTP interface are required; D-Link does not state whether exploitation causes a crash or code execution.

CVSS severity9.8
Critical
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in D-Link DIR-868L A1 firmware 1.12 allows remote authenticated users to corrupt memory through an HTTP request. The scandir.sgi binary copies a user-supplied HTTP query value into a fixed-length stack buffer without first validating its length. Authentication and network access to the HTTP interface are required; D-Link does not state whether exploitation causes a crash or code execution.

The record

CVE
CVE-2023-29856
Published
May 2, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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