Stack-Based Buffer Overflow in D-Link DIR-895L A1_102b07
CVE-2026-86509

9.4CRITICAL

Key Information:

Vendor

D-link
Status
Dir-895l
Vendor
CVE Published:
8 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86509?

A vulnerability exists in the D-Link DIR-895L A1_102b07 router due to a flaw in the sendOffer/sendACK functions within the udhcpcd/serverpacket.c file. This flaw can lead to a stack-based buffer overflow, potentially allowing an attacker to execute arbitrary code. The attack requires access to the local network, making it imperative for users to secure their network and router settings to mitigate any risks associated with this exploit. Publicly available exploit techniques increase the urgency for users to apply appropriate mitigations.

Affected Version(s)

DIR-895L A1_102b07

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-2026-86509 - Proof of Concept

References

https://vuldb.com/vuln/399662
vdb-entrytechnical-description
https://vuldb.com/vuln/399662/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86509
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent 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)
.