CVE-2025-4883Public exploitNetwork attack vector

Authenticated service crash via unchecked parameter copies

Published May 18, 2025 · Updated May 19, 2025

Stack-based buffer overflow in D-Link DI-8100 16.07.26A1 allows remote authenticated users to crash the jhttpd service. The ctxz_asp function processes def, defTcp, defUdp, defIcmp, and defOther with sprintf, then copies the values into the stack-local v47 buffer without enforcing a length bound. A valid administrator session is required; oversized values have been demonstrated to make the management service and device network interface unreachable.

CVSS severity8.6
High
EPSS probability8.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in D-Link DI-8100 16.07.26A1 allows remote authenticated users to crash the jhttpd service. The ctxz_asp function processes def, defTcp, defUdp, defIcmp, and defOther with sprintf, then copies the values into the stack-local v47 buffer without enforcing a length bound. A valid administrator session is required; oversized values have been demonstrated to make the management service and device network interface unreachable.

The record

CVE
CVE-2025-4883
Published
May 18, 2025
Updated
May 19, 2025
Vendor
D-Link
Product
DI-8100
Classifications
CWE-787, CWE-119, CWE-121, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 19, 2025Record 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=16.07.26A1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

D-Link · DI-8100version=16.07.26A1

Published CVSS scores

8.6VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.2VulDB CNACVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.3VulDB CNAAV:N/AC:L/Au:M/C:C/I:C/A:C
7.2VulDB CNACVSS:3.0/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
T1499Endpoint Denial of Service

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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