Out-of-Bounds Write Vulnerability in D-Link DIR-822A Router
CVE-2026-86510

9.4CRITICAL

Key Information:

Vendor

D-link
Status
Dir-822a
Vendor
CVE Published:
8 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86510?

A critical vulnerability has been identified in the D-Link DIR-822A A_101 router, specifically within the tunnel_set_params function of the L2TP Control Message Parser. This vulnerability allows for an out-of-bounds write condition that can be exploited remotely. The public disclosure of this exploit raises significant security concerns as unauthorized manipulation may lead to system compromises. Users are advised to take necessary precautions to safeguard their devices against potential attacks.

Affected Version(s)

DIR-822A A_101

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-2026-86510 - Proof of Concept

References

https://vuldb.com/vuln/399663
vdb-entrytechnical-description
https://vuldb.com/vuln/399663/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86510
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
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)
.