CVE-2023-37008

MME crash via out-of-bounds ASN.1 choice index

Published Jan 22, 2025 · Updated Jan 28, 2025

Buffer overflow in Open5GS MME 2.6.4 and earlier allows attackers to crash the MME via a malformed ASN.1 S1AP packet. CHOICE_decode_aper uses a one-bit value to index a one-element type-descriptor array, so value 1 selects adjacent structured data that is later freed or called through. Reachability requires S1AP access from a base station or equivalent foothold; repeated packets interrupt LTE service, while forged function pointers provide the reported code-execution path.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Open5GS MME 2.6.4 and earlier allows attackers to crash the MME via a malformed ASN.1 S1AP packet. CHOICE_decode_aper uses a one-bit value to index a one-element type-descriptor array, so value 1 selects adjacent structured data that is later freed or called through. Reachability requires S1AP access from a base station or equivalent foothold; repeated packets interrupt LTE service, while forged function pointers provide the reported code-execution path.

The record

CVE
CVE-2023-37008
Published
Jan 22, 2025
Updated
Jan 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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