CVE-2023-37016Public exploitNetwork attack vector

MME crash via failed S1AP error response

Published Jan 22, 2025 · Updated Feb 6, 2025

Reachable assertion in Open5GS MME 2.6.4 and earlier allows remote attackers to crash the service via a malformed S1AP response. When MME_UE_S1AP_ID is absent, s1ap_handle_ue_context_modification_response sends an error indication and asserts that the send succeeded. Network reachability to the S1AP interface is required; repeated malformed responses terminate the MME process and interrupt service.

CVSS severity8.6
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in Open5GS MME 2.6.4 and earlier allows remote attackers to crash the service via a malformed S1AP response. When MME_UE_S1AP_ID is absent, s1ap_handle_ue_context_modification_response sends an error indication and asserts that the send succeeded. Network reachability to the S1AP interface is required; repeated malformed responses terminate the MME process and interrupt service.

The record

CVE
CVE-2023-37016
Published
Jan 22, 2025
Updated
Feb 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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