CVE-2026-86297: Off-by-One in D-Link DIR-605
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.
CVSS v4.0
Score 9.2critical
Affected software
D-Link
DIR-605
cpe:2.3:h:d-link:dir-605:*:*:*:*:*:*:*:*AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects the function tunnel_set_params in the file progs.gpl/pppd.alpha/l2tp/tunnel.c of the D-Link DIR-605 B1v202WWB03 router. An off-by-one error occurs due to manipulation of the peer_hostname argument in the L2TP Control Message Parser component. The flaw allows a remote attacker to potentially exploit the device, but the attack complexity is high. Public exploit code exists, indicating the vulnerability is known and potentially exploitable despite difficulty.
Potential Impact
The vulnerability has a CVSS 4.0 score of 9.2 (critical), indicating a severe impact if exploited. It allows remote attackers to leverage an off-by-one error in the L2TP parser, potentially leading to memory corruption or other adverse effects. However, the attack complexity is high, and no known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided. Due to the complexity of exploitation, immediate exploitation risk is lower, but monitoring vendor updates for patches is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-06T16:18:00.386Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9e9778acd9273b4979791c
Added to database: 09/07/2026, 10:52:40 UTC
Last enriched: 09/15/2026, 00:37:17 UTC
Last updated: 10/23/2026, 01:15:27 UTC
Views: 160
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.