VDB-293020 · CVE-2023-37021 · GCVE-0-2023-37021

Open5GS MME up to 2.6.4 S1AP Packet MME_UE_S1AP_ID denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.5	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in Open5GS MME up to 2.6.4. This affects the function MME_UE_S1AP_ID of the component S1AP Packet Handler. Executing a manipulation can lead to denial of service. This vulnerability is registered as CVE-2023-37021. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Open5GS MME up to 2.6.4. It has been declared as critical. This vulnerability affects the function MME_UE_S1AP_ID of the component S1AP Packet Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

Open5GS MME version <= 2.6.4 contains an assertion that can be remotely triggered via a malformed ASN.1 packet over the S1AP interface. An attacker may send a `UE Context Modification Failure` message missing a required `MME_UE_S1AP_ID` field to repeatedly crash the MME, resulting in denial of service.

The advisory is shared for download at cellularsecurity.org. This vulnerability was named CVE-2023-37021 since 06/28/2023. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Open5GS

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.5
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/28/2023 🔍
01/22/2025 +574 days 🔍
01/22/2025 +0 days 🔍
02/07/2025 +16 days 🔍

Sourcesinfo

Advisory: cellularsecurity.org
Status: Not defined

CVE: CVE-2023-37021 (🔍)
GCVE (CVE): GCVE-0-2023-37021
GCVE (VulDB): GCVE-100-293020

Entryinfo

Created: 01/22/2025 17:10
Updated: 02/07/2025 09:04
Changes: 01/22/2025 17:10 (18), 01/22/2025 17:13 (30), 01/22/2025 17:14 (2), 01/22/2025 17:17 (6), 01/22/2025 17:21 (4), 01/22/2025 17:24 (4), 02/07/2025 09:04 (1)
Complete: 🔍
Committer: mitr
Cache ID: 216::103