Free5GC up to 4.1.0 SMF establishPfcpSession null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Free5GC up to 4.1.0. This affects the function establishPfcpSession of the component SMF. The manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2026-1973. Remote exploitation of the attack is possible. Furthermore, an exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Free5GC up to 4.1.0. This issue affects the function establishPfcpSession of the component SMF. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-1973. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-5605). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 5.3
CNA Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: github.com

Timelineinfo

02/05/2026 Advisory disclosed
02/05/2026 +0 days VulDB entry created
02/09/2026 +4 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 815
Status: Confirmed

CVE: CVE-2026-1973 (🔒)
GCVE (CVE): GCVE-0-2026-1973
GCVE (VulDB): GCVE-100-344495
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/05/2026 14:38
Updated: 02/09/2026 17:03
Changes: 02/05/2026 14:38 (57), 02/06/2026 06:34 (31), 02/07/2026 14:37 (1), 02/09/2026 17:03 (11)
Complete: 🔍
Submitter: ZiyuLin
Cache ID: 216::103

Submitinfo

Accepted

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