CVE-2026-7854Public exploitNetwork attack vector

Web interface crash via unbounded sprintf

Published May 5, 2026 · Updated May 5, 2026

Stack buffer overflow in D-Link DI-8100 16.07.26A1 allows remote attackers to crash its web interface via a crafted POST request. The url_rule_asp handler passes the attacker-controlled name parameter to sprintf, concatenating it into a fixed eight-byte stack buffer without a length check. The handler runs after session validation, and the public proof of concept authenticates before sending the oversized value; successful exploitation leaves the web interface unavailable until the device is physically rebooted.

CVSS severity9.8
Critical
EPSS probability5.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in D-Link DI-8100 16.07.26A1 allows remote attackers to crash its web interface via a crafted POST request. The url_rule_asp handler passes the attacker-controlled name parameter to sprintf, concatenating it into a fixed eight-byte stack buffer without a length check. The handler runs after session validation, and the public proof of concept authenticates before sending the oversized value; successful exploitation leaves the web interface unavailable until the device is physically rebooted.

The record

CVE
CVE-2026-7854
Published
May 5, 2026
Updated
May 5, 2026
Vendor
D-Link
Product
DI-8100
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 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=16.07.26A1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DI-8100version=16.07.26A1

Published CVSS scores

10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9VulDBCVSS:4.0/AV:N/AC:L/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.

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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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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

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Your stack

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