Open5GS up to 2.7.2 PFCP Library ogs_pfcp_subnet_add session.dnn buffer overflow

Summaryinfo

A vulnerability classified as critical has been found in Open5GS up to 2.7.2. Affected is the function ogs_pfcp_subnet_add of the component PFCP Library. The manipulation of the argument session.dnn leads to buffer overflow. This vulnerability is referenced as CVE-2025-44952. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Open5GS up to 2.7.2. It has been rated as critical. This issue affects the function ogs_pfcp_subnet_add of the component PFCP Library. The manipulation of the argument session.dnn with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A missing length check in `ogs_pfcp_subnet_add` function from PFCP library, used by both smf and upf in open5gs 2.7.2 and earlier, allows a local attacker to cause a Buffer Overflow by changing the `session.dnn` field with a value with length greater than 101.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-44952 since 04/22/2025. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-18654). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Open5GS

Version

• 2.7.0
• 2.7.1
• 2.7.2

Website

• Product: https://github.com/open5gs/open5gs/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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