Off-by-One Vulnerability in D-Link DIR-605 Router L2TP Control Message Parser
CVE-2026-86297

9.2CRITICAL

Key Information:

Vendor

D-link
Status
Dir-605
Vendor
CVE Published:
7 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86297?

A vulnerability has been identified in the D-Link DIR-605 router, specifically within the L2TP Control Message Parser's tunnel_set_params function. This issue arises from improper manipulation of the peer_hostname argument, leading to an off-by-one condition that can allow remote attackers to exploit the router. The complexity of exploiting this vulnerability is high, and while the exploit is publicly available, it requires advanced techniques to execute effectively.

Affected Version(s)

DIR-605 B1v202WWB03

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-86297 - Proof of Concept

References

https://vuldb.com/vuln/399459
vdb-entrytechnical-description
https://vuldb.com/vuln/399459/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86297
third-party-advisory

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

tian (VulDB User)
.