CVE-2026-86297 D-Link DIR-605 L2TP Control Message tunnel.c tunnel_set_params off-by-one
Remote attackers can exploit an off-by-one error in the L2TP parser to potentially execute code or cause denial of service on D-Link DIR-605 routers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86297?
CVE-2026-86297 is a critical vulnerability in D-Link DIR-605, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-86297?
How do I fix CVE-2026-86297?
No fix has been published for CVE-2026-86297 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-86297 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86297 exists.
Sources
Also known as GHSA-fwmj-7xm4-cg9r.