Is CVE-2026-37221 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-37221 being exploited in the wild.

How severe is CVE-2026-37221?

Informational severity, with a CVSS score of 7.5, published 1 June 2026.

Which products and versions are affected?

EURECOM FlexRIC v2.0.0 through commit 6a595d8b.

Is there a fix for CVE-2026-37221?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-37221 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-37221?

Check whether you run EURECOM FlexRIC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-37221: EURECOM FlexRIC denial of service via forged subscription response

CVE-2026-37221 · Severity: info · CVSS 7.5 · Published 2026-06-01

FlexRIC is a software controller used in Open RAN (Radio Access Network) environments to manage cellular network functions. A vulnerability allows an unauthenticated remote attacker to crash the controller by sending a specially crafted message. This results in a denial-of-service (DoS) condition, potentially disrupting mobile network operations and management.

Technologies: EURECOM FlexRIC. Vendors: EURECOM.

Quick answers

Is CVE-2026-37221 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-37221 being exploited in the wild.
How severe is CVE-2026-37221?: Informational severity, with a CVSS score of 7.5, published 1 June 2026.
Which products and versions are affected?: EURECOM FlexRIC v2.0.0 through commit 6a595d8b.
Is there a fix for CVE-2026-37221?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-37221 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-37221?: Check whether you run EURECOM FlexRIC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Reachable Assertion (CWE-617) exists in the near-RT RIC component of FlexRIC v2.0.0. The vulnerability is located in the 'stop_pending_event()' function within 'src/ric/msg_handler_ric.c'. When the RIC receives a 'RIC_SUBSCRIPTION_RESPONSE' with an unknown 'ric_id', it attempts to extract a non-existent key from a bimap without prior validation. In debug builds, this triggers an 'assert()' leading to a SIGABRT; in release builds where assertions are stripped, it results in a NULL pointer dereference and a SIGSEGV. Attackers can exploit this by sending a forged SCTP packet to port 36421.

Affected products

EURECOM FlexRIC v2.0.0 through commit 6a595d8b

Timeline

2026-06-01: disclosed
2026-06-01: advisory

References

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