CVE-2025-56394: free5gc Heap-based Buffer Overflow

Vulnerability summary

CVE-2025-56394 is a high (CVSS 7.5) Heap-based Buffer Overflow vulnerability in free5gc. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.6% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 23-09-2025
   PublishedVulnerability first disclosed.
2. 24-09-2025
   Last modifiedVulnerability information updated.

Description

Free5gc 4.0.1 is vulnerable to Buffer Overflow. The AMF incorrectly validates the 5GS mobile identity, resulting in slice reference overflow.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().