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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.

D-Link DIR-605是中国D-Link公司的一款家用无线路由器。 D-Link DIR-605 B1v202WWB03版本存在数字错误漏洞，该漏洞源于L2TP Control Message Parser组件中tunnel_set_params函数对文件progs.gpl/pppd.alpha/l2tp/tunnel.c中peer_hostname参数的处理存在差一错误，攻击者可远程利用该漏洞。

CVSS 8.1 · High EPSS 1.12% · P66

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
D-Link DIR-605 B1v202WWB03 affected
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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
Vulnerability Title
D-Link DIR-605 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DIR-605是中国D-Link公司的一款家用无线路由器。 D-Link DIR-605 B1v202WWB03版本存在数字错误漏洞，该漏洞源于L2TP Control Message Parser组件中tunnel_set_params函数对文件progs.gpl/pppd.alpha/l2tp/tunnel.c中peer_hostname参数的处理存在差一错误，攻击者可远程利用该漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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Security Blog Posts for CVE-2026-86297 (1)

Vendor Pages for CVE-2026-86297 (1)

Other References for CVE-2026-86297 (3)

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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