How severe is CVE-2026-37231?

CVE-2026-37231 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-37231 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-37231?

CVE-2026-37231 affects Mosaic5g Flexric. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-37231?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-37231 have an EU (EUVD) identifier?

Yes. CVE-2026-37231 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33864.

When was CVE-2026-37231 published?

CVE-2026-37231 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-37231

CVE-2026-37231 is a high-severity vulnerability in Mosaic5g Flexric with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33864
Weakness: CWE-191
Affected product: Mosaic5g Flexric
Published: 2026-06-01
Last modified: 2026-06-17

Description

FlexRIC v2.0.0 uses a uint16_t counter for xapp_id assignment but stores the value in uint32_t message fields. After 65,530+ E42_SETUP_REQUESTs, the 16-bit counter wraps around and produces duplicate xapp_ids. The iApp (port 36422) crashes when attempting to register a duplicate ID in its internal data structure. A remote attacker can trigger this by repeatedly connecting and requesting new xApp registrations.

Frequently asked questions

What is CVE-2026-37231?: FlexRIC v2.0.0 uses a uint16_t counter for xapp_id assignment but stores the value in uint32_t message fields. After 65,530+ E42_SETUP_REQUESTs, the 16-bit counter wraps around and produces duplicate xapp_ids. The iApp (port 36422) crashes when attempting to register a duplicate ID in its internal data structure. A remote attacker can trigger this by repeatedly connecting and requesting new xApp registrations.
How severe is CVE-2026-37231?: CVE-2026-37231 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-37231 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-37231?: CVE-2026-37231 affects Mosaic5g Flexric. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-37231?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-37231 have an EU (EUVD) identifier?: Yes. CVE-2026-37231 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33864.
When was CVE-2026-37231 published?: CVE-2026-37231 was published on 2026-06-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mosaic5g:flexric:2.0.0:*:*:*:*:*:*:*

More vulnerabilities in Mosaic5g Flexric

CVE-2026-37234 — High (CVSS 8.2): FlexRIC v2.0.0 allows a single SCTP connection to bind multiple xapp_ids by sending multiple E42_SETUP_REQUESTs. On…
CVE-2026-37235 — High (CVSS 7.5): FlexRIC v2.0.0 trusts the xapp_id field from E42 message payloads without binding it to the sender's SCTP association.…
CVE-2026-37233 — High (CVSS 7.5): FlexRIC v2.0.0 contains an authorization bypass in the iApp's xApp isolation mechanism. The equality function…
CVE-2026-37230 — High (CVSS 7.5): FlexRIC v2.0.0 crashes when the near-RT RIC receives a RIC_INDICATION message with a ran_func_id that does not exist in…
CVE-2026-37229 — High (CVSS 7.5): FlexRIC v2.0.0 contains a reachable assertion in e2ap_create_pdu() triggered when ASN.1 PER decoding fails. A remote…
CVE-2026-37228 — High (CVSS 7.5): FlexRIC v2.0.0 contains a reachable assertion in e2ap_recv_sctp_msg() (src/lib/ep/e2ap_ep.c). The function allocates a…

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