CVE-2026-2856Public exploitNetwork attack vector

Authenticated web-server crash via unchecked submit-url copy

Published Feb 20, 2026 · Updated Feb 20, 2026

Stack-based buffer overflow in D-Link DWR-M960 1.01.07 allows remote authenticated users to crash its web server via formFilter. The sub_424AFC handler copies the request-controlled submit-url value into the fixed-size wizard_htm buffer with strcpy and no length check. The vulnerable path requires a save_apply POST; the published reproduction crashes boa and leaves the device unreachable, while code execution is not demonstrated.

CVSS severity8.8
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in D-Link DWR-M960 1.01.07 allows remote authenticated users to crash its web server via formFilter. The sub_424AFC handler copies the request-controlled submit-url value into the fixed-size wizard_htm buffer with strcpy and no length check. The vulnerable path requires a save_apply POST; the published reproduction crashes boa and leaves the device unreachable, while code execution is not demonstrated.

The record

CVE
CVE-2026-2856
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
D-Link
Product
DWR-M960
Classifications
CWE-121, CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.01.07

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DWR-M960version=1.01.07

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

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Your stack

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