Is CVE-2026-27643 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-27643, but active exploitation has not been confirmed.

Can CVE-2026-27643 be exploited remotely?

Yes. CVE-2026-27643 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27643?

CVE-2026-27643 has a CVSS score of 5.3 (MEDIUM) and an EPSS exploitation probability of 0.02%.

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MEDIUMPOC

CVE-2026-27643

CWE-209Published: February 24, 2026· Updated: Feb 25, 2026

5.3

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:15.0th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-27643 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A proof-of-concept (PoC) exploit exists for CVE-2026-27643. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.