Vulnerability · Published Sep 7, 2026 · Assigned by VulDB

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

High 8.1

In plain English

A high-severity security flaw in DIR-605 from D-Link. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)1.1%top 33.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
D-Link	DIR-605	B1v202WWB03

Weakness: CWE-193, CWE-189 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-399459 | D-Link DIR-605 L2TP Control Message tunnel.c tunnel_set_params off-by-one vdb-entry, technical-description
VDB-399459 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-86297 | CVE Analysis and Report third-party-advisory
Submit #906299 | D-Link DIR605 B1v202WWB03 B1v202WWB03 Out-of-bounds Write third-party-advisory
https://tzh00203.notion.site/D-Link-DIR-605-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a809ba163f988c15fc1b7 exploit
https://www.dlink.com/ broken-link, product