Denial of Service Vulnerability in INSTAR 2K+ and 4K Backend IPC Server
CVE-2025-8761

8.7HIGH

Key Information:

Vendor

Instar

Status
2k+
4k
Vendor
CVE Published:
13 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8761?

A critical vulnerability has been identified in the INSTAR 2K+ and 4K series, specifically within the Backend IPC Server component. This vulnerability allows for potential denial of service attacks that can be initiated remotely, disrupting the normal operations of the affected devices. As the exploit has already been disclosed to the public, it poses a significant threat to users of the identified versions. Organizations utilizing these products are advised to apply available security patches and closely monitor their systems for any unusual activity.

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Deploy the Patch

Affected Version(s)

2K+ 3.11.1 Build 1124

4K 3.11.1 Build 1124

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-2025-8761 - Proof of Concept

References

https://vuldb.com/?id.319864
vdb-entry
https://vuldb.com/?ctiid.319864
signaturepermissions-required
https://modzero.com/static/MZ-25-03_modzero_INSTAR.pdf
exploit

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
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

Michael Imfeld (modzero AG)
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