Denial of Service Vulnerability in Open5GS by Open5GS
CVE-2026-4240

6.9MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4240?

A vulnerability in Open5GS up to version 2.7.6 can lead to a denial of service through specific functions within the CCA Handler, including smf_gx_cca_cb and smf_gy_cca_cb. This issue can be exploited remotely, allowing attackers to disrupt services without physical access. It is recommended to upgrade to Open5GS version 2.7.7, which contains a fix for this vulnerability, identified under patch name 80eb484a6ab32968e755e628b70d1a9c64f012ec.

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Affected Version(s)

Open5GS 2.7.0

Open5GS 2.7.1

Open5GS 2.7.2

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-2026-4240 - Proof of Concept

References

https://vuldb.com/?id.351182
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351182
signaturepermissions-required
https://vuldb.com/?submit.771361
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
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

ZiyuLin (VulDB User)
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