要点
- CVE-2026-33063 は github.com/free5gc/ausf, free5gc (free5gc) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.68%（全脆弱性の 52.3% より高い）。
- 対処：1.4.2 以降に更新してください。
概要
Impact
This is an Improper Null Check vulnerability leading to Denial of Service.
- Security Impact: A remote attacker can cause the AUSF service to panic and crash by sending a crafted UE authentication request that triggers a nil interface conversion in the
GetSupiFromSuciSupiMap function. This results in complete denial of service for the AUSF authentication service.
- Functional Impact: The
GetSupiFromSuciSupiMap function attempts to perform an interface conversion from interface{} to *context.SuciSupiMap without checking if the underlying value is nil. When SuciSupiMap is nil, the code panics with "interface conversion: interface {} is nil, not *context.SuciSupiMap".
- Affected Parties: All deployments of free5GC v4.0.1 using the AUSF UE authentication service (
/nausf-auth/v1/ue-authentications endpoint).
Patches
Yes, the issue has been patched.
The fix is implemented in PR free5gc/ausf#52 (commit: [add specific commit hash if available]).
Users should upgrade to the next release of free5GC that includes this commit.
Workarounds
There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the AUSF API to trusted sources only.
NVD の説明
free5GC is an open source 5G core network. free5GC AUSF prior to version 1.4.2 has is an Improper Null Check vulnerability leading to Denial of Service. All deployments of free5GC v4.0.1 using the AUSF UE authentication service (`/nausf-auth/v1/ue-authentications` endpoint) are affected. A remote attacker can cause the AUSF service to panic and crash by sending a crafted UE authentication request that triggers a nil interface conversion in the `GetSupiFromSuciSupiMap` function. This results in complete denial of service for the AUSF authentication service. The `GetSupiFromSuciSupiMap` function attempts to perform an interface conversion from `interface{}` to `*context.SuciSupiMap` without checking if the underlying value is nil. When `SuciSupiMap` is nil, the code panics with "interface conversion: interface {} is nil, not *context.SuciSupiMap". free5GC AUSF version 1.4.2 patches the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the AUSF API to trusted sources only.
github.com/free5gc/ausf のその他の脆弱性
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