CVE-2023-37033

MME crash via missing EUTRAN CGI field

Published Jan 21, 2025 · Updated Mar 20, 2025

Null pointer dereference in Magma MME 1.8.0 and earlier allows network-adjacent attackers to crash the service with a malformed S1AP message. The s1ap_mme_handle_initial_ue_message function leaves ie null when an Initial UE Message omits EUTRAN_CGI, then dereferences ie to read the PLMN identity size. Access to the S1 interface is sufficient, and one crafted packet interrupts the MME and associated cellular service.

CVSS severity6.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Magma MME 1.8.0 and earlier allows network-adjacent attackers to crash the service with a malformed S1AP message. The s1ap_mme_handle_initial_ue_message function leaves ie null when an Initial UE Message omits EUTRAN_CGI, then dereferences ie to read the PLMN identity size. Access to the S1 interface is sufficient, and one crafted packet interrupts the MME and associated cellular service.

The record

CVE
CVE-2023-37033
Published
Jan 21, 2025
Updated
Mar 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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