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

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-07 · updated 2026-09-09
Weakness: CWE-189

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

D-Link DIR-605: B1v202WWB03

References

https://tzh00203.notion.site/D-Link-DIR-605-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a809ba163f988c15fc1b7
https://vuldb.com/cve/CVE-2026-86297
https://vuldb.com/submit/906299
https://vuldb.com/vuln/399459
https://vuldb.com/vuln/399459/cti
https://www.dlink.com/

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