Improper Verification of Cryptographic Signature in D-Link DCS-930L Emergency HTTP Recovery Server
CVE-2026-108971

9.4CRITICAL

Key Information:

Vendor

D-link
Status
Dcs-930l
Vendor
CVE Published:
13 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-108971?

A vulnerability exists in the D-Link DCS-930L B1.08B4 model that affects the emergency HTTP recovery server component. The flaw lies in the mpfd_decode function within the bootloader_region.bin file. An attacker could exploit this issue by manipulating the firmware argument, leading to improper verification of the cryptographic signature. This vulnerability is exploitable remotely, highlighting a significant security risk for users relying on the affected product.

Affected Version(s)

DCS-930L B1.08B4

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-2026-108971 - Proof of Concept

References

https://vuldb.com/vuln/416789
vdb-entrytechnical-description
https://vuldb.com/vuln/416789/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-108971
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

sleep (VulDB User)
.