Integer overflow in Mosaic5g Flexric
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Mosaic5g Flexric — versions 2.0.0
Weakness classification (CWE)
References
- gitlab.eurecom.fr/mosaic5g/flexric (Product)
- github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisor… (Exploit, Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2026-37231?
- CVE-2026-37231 is a high-severity vulnerability in Mosaic5g Flexric, classified under Integer Underflow. CVSS score: 7.5/10. Published 2026-06-01.
- How severe is CVE-2026-37231?
- High severity. CVSS v3 base score is 7.5 out of 10.