Free5GC up to 1.4.1 NEF Nnef_PfdManagement information exposure

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Free5GC up to 1.4.1 and classified as problematic. Affected by this vulnerability is the function Nnef_PfdManagement of the component NEF Component. Executing a manipulation can lead to information exposure. This vulnerability is tracked as CVE-2026-27643. The attack can be launched remotely. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability has been found in Free5GC up to 1.4.1 and classified as problematic. This vulnerability affects the function Nnef_PfdManagement of the component NEF Component. The manipulation with an unknown input leads to a information exposure vulnerability. The CWE definition for the vulnerability is CWE-209. The product generates an error message that includes sensitive information about its environment, users, or associated data. As an impact it is known to affect confidentiality. CVE summarizes:

free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be affected. free5gc/udr pull request 56 contains a patch for the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-27643 since 02/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Applying the patch 754d23b03755ad59077ed529ce3b971e477080c4 is able to eliminate this problem. The bugfix is ready for download at github.com.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Version

License

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: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Information exposure
CWE: CWE-209 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

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: 754d23b03755ad59077ed529ce3b971e477080c4

Timelineinfo

02/20/2026 CVE reserved
02/24/2026 +4 days Advisory disclosed
02/24/2026 +0 days VulDB entry created
02/24/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 753
Status: Confirmed

CVE: CVE-2026-27643 (🔒)
GCVE (CVE): GCVE-0-2026-27643
GCVE (VulDB): GCVE-100-347512

Entryinfo

Created: 02/24/2026 07:51
Changes: 02/24/2026 07:51 (69)
Complete: 🔍
Cache ID: 216::103

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