Buffer Overflow Vulnerability in D-Link DI-8100 Router
CVE-2026-7857

8.6HIGH

Key Information:

Vendor

D-link
Status
Di-8100
Vendor
CVE Published:
5 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7857?

The D-Link DI-8100 router contains a vulnerability in the sprintf function located within the /user_group.asp file of the CGI Handler component. This vulnerability allows an attacker to execute a buffer overflow, potentially leading to unauthorized actions on the device. The attack can be initiated remotely, posing a significant risk as the exploit has been publicly disclosed. Network administrators should immediately assess their devices for this flaw and apply necessary patches to mitigate potential exploits.

Affected Version(s)

DI-8100 16.07.26A1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-7857 - Proof of Concept

References

https://vuldb.com/vuln/361134
vdb-entrytechnical-description
https://vuldb.com/vuln/361134/cti
signaturepermissions-required
https://vuldb.com/submit/807853
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

draw (VulDB User)
.