CVE-2026-71958Network attack vector

Unauthenticated command execution via oversized CGI fields

Published Aug 8, 2026 · Updated Aug 8, 2026

Buffer overflow in D-Link DWR-M961 C1 firmware before 1.1.5_C1_202607071108 allows remote attackers to execute commands or crash the router. The quicksetup.cgi handler copies overly long test4, ssid2, and username values without checking destination bounds, permitting payload-controlled memory corruption. Network access to the web-management CGI is sufficient; successful exploitation executes commands, while failed attempts can crash the device.

CVSS severity9.3
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in D-Link DWR-M961 C1 firmware before 1.1.5_C1_202607071108 allows remote attackers to execute commands or crash the router. The quicksetup.cgi handler copies overly long test4, ssid2, and username values without checking destination bounds, permitting payload-controlled memory corruption. Network access to the web-management CGI is sufficient; successful exploitation executes commands, while failed attempts can crash the device.

The record

CVE
CVE-2026-71958
Published
Aug 8, 2026
Updated
Aug 8, 2026
Vendor
D-Link
Product
DWR-M961
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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=0 <1.1.5_C1_202607071108

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DWR-M961version=0 <1.1.5_C1_202607071108

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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