CVE-2023-37034

MME crash via unchecked missing TAI field

Published Jan 21, 2025 · Updated Mar 24, 2025

A null pointer dereference in Magma MME 1.8.0 and earlier allows network-adjacent attackers to crash the service via malformed S1AP input. In s1ap_mme_handle_initial_ue_message, a failed lookup leaves ie null when TAI is absent, but OCTET_STRING_TO_TAC dereferences it. Access to the S1 interface is required; no credentials or user interaction are needed, and repeated malformed messages can prolong the MME outage.

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

A null pointer dereference in Magma MME 1.8.0 and earlier allows network-adjacent attackers to crash the service via malformed S1AP input. In s1ap_mme_handle_initial_ue_message, a failed lookup leaves ie null when TAI is absent, but OCTET_STRING_TO_TAC dereferences it. Access to the S1 interface is required; no credentials or user interaction are needed, and repeated malformed messages can prolong the MME outage.

The record

CVE
CVE-2023-37034
Published
Jan 21, 2025
Updated
Mar 24, 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 24, 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

6.5NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5CISACVSS: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 DoS

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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