CVE-2023-37021 Denial of service in n/a

Q: Is CVE-2023-37021 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37021 exists.

Q: How do I fix CVE-2023-37021?

No fix has been published for CVE-2023-37021 yet. Limit exposure of the affected software until one is available.

High 8.6 Published 22 Jan 2025 Updated 6 Feb 2025

Remote attackers can crash the Open5GS MME by sending malformed S1AP packets, causing a denial of service in 5G core networks.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-37021?

CVE-2023-37021 is a high-severity denial of service vulnerability in Open5gs Open5gs, published on 22 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-617

Which versions are affected by CVE-2023-37021?

It affects 1 product.

Products include Open5gs Open5gs.

How do I fix CVE-2023-37021?

No fix has been published for CVE-2023-37021 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-37021 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37021 exists.

All Open5gs Open5gs vulnerabilities

Sources

Also known as GHSA-2g4r-3v66-3h7f.