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CVE-2026-86297— D-Link DIR-605 L2TP Control Message tunnel.c tunnel_set_params off-by-one

Quick assessment

Affected
D-Link DIR-605
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-605 B1v202WWB03 中发现了一个漏洞。该问题影响 L2TP 控制消息解析器组件中， 文件中 函数的逻辑。对参数 的不当操作导致了“差一错误”（off-by-one）。该攻击可以从远程发起。此类攻击在实施上具有较高的复杂性。其可利用性评估为“困难”。该漏洞的利用方式已公开，并可能已被实际使用。

CVSS 8.1 · High

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2026-86297

Vulnerability Information
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Vulnerability Title
D-Link DIR-605 L2TP Control Message tunnel.c tunnel_set_params off-by-one
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in D-Link DIR-605 B1v202WWB03. This issue affects the function tunnel_set_params of the file progs.gpl/pppd.alpha/l2tp/tunnel.c of the component L2TP Control Message Parser. Such manipulation of the argument peer_hostname  leads to off-by-one. The attack may be performed from remote. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit is publicly available and might be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
D-Link DIR-605 B1v202WWB03 cpe:2.3:h:d-link:dir-605:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-86297

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III. Intelligence Information for CVE-2026-86297

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Vendor Pages for CVE-2026-86297 (1)

Other References for CVE-2026-86297 (1)

Other References for CVE-2026-86297 (4)

Same Patch Batch · D-Link · 2026-09-07 · 3 CVEs total

CVE-2026-86296 10.0 CRITICAL D-Link DIR-822A udhcpcd serverpacket.c strcpy stack-based overflow
CVE-2026-86295 8.3 HIGH D-Link DIR-895L udhcpcd serverpacket.c sendACK command injection

IV. Related Vulnerabilities

Same product: DIR-605
Same vendor: D-Link
Same weakness: CWE-193

V. Comments for CVE-2026-86297

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