Description
FlexRIC v2.0.0 crashes when receiving a RIC_SUBSCRIPTION_RESPONSE with an unknown ric_id that has no corresponding pending event. The near-RT RIC uses assert() to enforce the existence of a pending event during response processing. A remote unauthenticated attacker can send a forged RIC_SUBSCRIPTION_RESPONSE to the near-RT RIC (port 36421) to cause SIGABRT in Debug builds or NULL pointer dereference (SIGSEGV) in Release builds.
Published: 2026-06-01
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability occurs in FlexRIC v2.0.0 when handling RIC_SUBSCRIPTION_RESPONSE messages that reference an unknown ric_id. The implementation uses an assert to verify that a pending event exists; if the ric_id is unknown the assertion triggers, causing the process to abort in debug builds or dereference a null pointer in release builds. An attacker can fabricate such a message and send it to the near‑RT RIC, leading to an immediate crash.

Affected Systems

All installations of FlexRIC version 2.0.0 are affected. This includes the open‑source projects hosted in the GitLab repository at gitlab.eurecom.fr/mosaic5g/flexric and the release provided by the FlexRIC developers.

Risk and Exploitability

The attack vector is remote, unauthenticated over TCP port 36421. Since the flaw results in a crash rather than data disclosure, it is a denial‑of‑service vulnerability. No exploit probability is listed in EPSS and the vulnerability is not currently in CISA KEV. However, because the failure occurs on reception of an untrusted network message, any machine exposed to the near‑RT interface is at risk if an attacker can reach it.

Generated by OpenCVE AI on June 1, 2026 at 16:27 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Deploy the latest version of FlexRIC where input validation for ric_id is performed or where the assert has been removed.
  • If no patch is available, block inbound traffic to TCP port 36421 from untrusted sources using firewall rules or network segmentation.
  • Configure the near‑RT RIC to log and ignore unknown ric_id values, or adjust configuration to disable strict event checking.

Generated by OpenCVE AI on June 1, 2026 at 16:27 UTC.

Tracking

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Advisories

No advisories yet.

History

Mon, 01 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-617
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 01 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Title Remote Unauthenticated RIC_SUBSCRIPTION_RESPONSE Crash in FlexRIC
Weaknesses CWE-398
CWE-476

Mon, 01 Jun 2026 15:00:00 +0000

Type Values Removed Values Added
Description FlexRIC v2.0.0 crashes when receiving a RIC_SUBSCRIPTION_RESPONSE with an unknown ric_id that has no corresponding pending event. The near-RT RIC uses assert() to enforce the existence of a pending event during response processing. A remote unauthenticated attacker can send a forged RIC_SUBSCRIPTION_RESPONSE to the near-RT RIC (port 36421) to cause SIGABRT in Debug builds or NULL pointer dereference (SIGSEGV) in Release builds.
References

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-01T16:47:59.561Z

Reserved: 2026-04-06T00:00:00.000Z

Link: CVE-2026-37221

cve-icon Vulnrichment

Updated: 2026-06-01T16:47:55.531Z

cve-icon NVD

Status : Received

Published: 2026-06-01T15:16:34.273

Modified: 2026-06-01T17:16:58.363

Link: CVE-2026-37221

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-01T16:30:06Z

Weaknesses