CVE-2026-86297Public exploitNetwork attack vector

Memory corruption via L2TP hostname off-by-one write

Published Sep 7, 2026 · Updated Sep 9, 2026

An off-by-one write in the D-Link DIR-605 B1v202WWB03 L2TP parser allows remote attackers to corrupt device memory. The tunnel_set_params function in progs.gpl/pppd.alpha/l2tp/tunnel.c mishandles a crafted peer_hostname AVP and writes beyond its intended buffer. No authentication or user interaction is required, but exploitation is highly complex; the public proof of concept establishes memory corruption, not reliable code execution.

CVSS severity8.1
High
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An off-by-one write in the D-Link DIR-605 B1v202WWB03 L2TP parser allows remote attackers to corrupt device memory. The tunnel_set_params function in progs.gpl/pppd.alpha/l2tp/tunnel.c mishandles a crafted peer_hostname AVP and writes beyond its intended buffer. No authentication or user interaction is required, but exploitation is highly complex; the public proof of concept establishes memory corruption, not reliable code execution.

The record

CVE
CVE-2026-86297
Published
Sep 7, 2026
Updated
Sep 9, 2026
Vendor
D-Link
Product
DIR-605
Classifications
CWE-189, CWE-193, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=B1v202WWB03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-605version=B1v202WWB03

Published CVSS scores

7.6VulDBAV:N/AC:H/Au:N/C:C/I:C/A:C
8.1VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.2VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-189Numeric Errors
CWE-193Off-by-one Error
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo