CVE-2025-63679: free5gc Classic Buffer Overflow
CVSS: 9.8v3.1CriticalAnalyzed
Published 12-11-2025Last modified 13-11-2025
Vulnerability summary
CVE-2025-63679 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in free5gc. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.6% of scored vulnerabilities. 2 public exploits are recorded.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
0.43%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2github
Timeline
- 12-11-2025PublishedVulnerability first disclosed.
- 13-11-2025Last modifiedVulnerability information updated.
Description
free5gc v4.1.0 and before is vulnerable to Buffer Overflow. When AMF receives an UplinkRANConfigurationTransfer NGAP message from a gNB, the AMF process crashes.
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSources2 sources · 7.5–9.8
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
EPSS trend
Probability
0.43%
Chance of exploitation in the next 30 days
Percentile
36%
Versus all other CVEs
30-day change
+0.03 pp
From 0.40% on 19-09-2026
19-09-202619-10-2026
EPSS score0.43%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundFree5Gc
Maturity: poc
5483D94B028D7A0C111Ca23844E8A94D
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Free5gc1 product
- free5gc≤ 4.1.0
1 vendor · 1 product