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CVE-2026-86509— D-Link DIR-895L udhcpcd serverpacket.c sendACK stack-based overflow

Quick assessment

Affected
D-Link DIR-895L
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 D-Link DIR-895L A1_102b07 中发现了一个缺陷。该缺陷影响 udhcpcd 组件中 udhcpcd/serverpacket.c 文件的 sendOffer/sendACK 功能。该操作会导致基于栈的缓冲区溢出。此漏洞仅可在局域网内被利用。该漏洞的利用方式已被公开，可能被用于实际攻击。

CVSS 9.6 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-86509

Vulnerability Information
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Vulnerability Title
D-Link DIR-895L udhcpcd serverpacket.c sendACK stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in D-Link DIR-895L A1_102b07. This impacts the function sendOffer/sendACK of the file udhcpcd/serverpacket.c of the component udhcpcd. This manipulation causes stack-based buffer overflow. The attack can only be done within the local network. The exploit has been published and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
D-Link DIR-895L A1_102b07 cpe:2.3:h:d-link:dir-895l:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-86509

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III. Intelligence Information for CVE-2026-86509

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Vendor Pages for CVE-2026-86509 (1)

Other References for CVE-2026-86509 (1)

Other References for CVE-2026-86509 (1)

IV. Related Vulnerabilities

Same product: DIR-895L
Same vendor: D-Link
Same weakness: CWE-121

V. Comments for CVE-2026-86509

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