CVE-2026-7857Public exploitNetwork attack vector

Authenticated service crash via unchecked sprintf

Published May 5, 2026 · Updated May 5, 2026

Stack buffer overflow in the CGI handler for D-Link DI-8100 16.07.26A1 allows remote authenticated users to crash the HTTP service. The /user_group.asp handler passes name, mem, pri, and attr parameters to sprintf, concatenating them into a fixed-size stack buffer without bounds checking. Administrative access is required; the published proof of concept demonstrates an HTTP-service crash, while code execution is not established.

CVSS severity7.2
High
EPSS probability4.16%
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 the CGI handler for D-Link DI-8100 16.07.26A1 allows remote authenticated users to crash the HTTP service. The /user_group.asp handler passes name, mem, pri, and attr parameters to sprintf, concatenating them into a fixed-size stack buffer without bounds checking. Administrative access is required; the published proof of concept demonstrates an HTTP-service crash, while code execution is not established.

The record

CVE
CVE-2026-7857
Published
May 5, 2026
Updated
May 5, 2026
Vendor
D-Link
Product
DI-8100
Classifications
CWE-120, CWE-119, T1499.004
Attack vector
network
Privileges
admin

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 privilegesadmin

What is affected?

D-Link · DI-8100version=16.07.26A1

Published CVSS scores

8.3VulDBAV:N/AC:L/Au:M/C:C/I:C/A:C
7.2VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Endpoint Denial of Service: Application 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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