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4 vulnerabilities found for ausf by free5gc
CVE-2026-53551 (GCVE-0-2026-53551)
Vulnerability from nvd – Published: 2026-07-31 20:12 – Updated: 2026-08-03 16:26
VLAI
EPSS
VEX
Title
free5GC AUSF: null byte injection in supiOrSuci causes HTTP 500 internal service failure
Summary
free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the free5GC AUSF (Authentication Server Function) does not validate the supiOrSuci field in UE authentication requests. Null bytes (\x00) and other control characters pass through JSON parsing unchanged and are forwarded to the UDM in an unescaped URL path. This causes Go's net/url.Parse() to fail, returning HTTP 500 "System failure" and leaking internal stack traces. An unauthenticated attacker can trigger this at scale causing denial of service for all subscribers attempting authentication through the affected AUSF. This vulnerability is fixed in 1.4.5.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 16:18 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/free5gc/free5gc/security/advis… | x_refsource_CONFIRM |
| https://github.com/free5gc/free5gc/issues/1048 | x_refsource_MISC |
| https://github.com/free5gc/ausf/pull/61 | x_refsource_MISC |
| https://github.com/free5gc/ausf/commit/bfc4a10094… | x_refsource_MISC |
| https://github.com/free5gc/ausf/releases/tag/v1.4.5 | x_refsource_MISC |
| https://github.com/free5gc/free5gc/releases/tag/v4.2.2 | x_refsource_MISC |
Impacted products
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CVE-2026-33063 (GCVE-0-2026-33063)
Vulnerability from nvd – Published: 2026-03-20 02:53 – Updated: 2026-03-20 18:08
VLAI
EPSS
VEX
Title
free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-20 16:35 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/free5gc/free5gc/security/advis… | x_refsource_CONFIRM |
| https://github.com/free5gc/free5gc/issues/778 | x_refsource_MISC |
| https://github.com/free5gc/ausf/pull/52 | x_refsource_MISC |
| https://github.com/free5gc/ausf/commit/3b9ac4403c… | x_refsource_MISC |
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CVE-2026-53551 (GCVE-0-2026-53551)
Vulnerability from cvelistv5 – Published: 2026-07-31 20:12 – Updated: 2026-08-03 16:26
VLAI
EPSS
VEX
Title
free5GC AUSF: null byte injection in supiOrSuci causes HTTP 500 internal service failure
Summary
free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the free5GC AUSF (Authentication Server Function) does not validate the supiOrSuci field in UE authentication requests. Null bytes (\x00) and other control characters pass through JSON parsing unchanged and are forwarded to the UDM in an unescaped URL path. This causes Go's net/url.Parse() to fail, returning HTTP 500 "System failure" and leaking internal stack traces. An unauthenticated attacker can trigger this at scale causing denial of service for all subscribers attempting authentication through the affected AUSF. This vulnerability is fixed in 1.4.5.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 16:18 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/free5gc/free5gc/security/advis… | x_refsource_CONFIRM |
| https://github.com/free5gc/free5gc/issues/1048 | x_refsource_MISC |
| https://github.com/free5gc/ausf/pull/61 | x_refsource_MISC |
| https://github.com/free5gc/ausf/commit/bfc4a10094… | x_refsource_MISC |
| https://github.com/free5gc/ausf/releases/tag/v1.4.5 | x_refsource_MISC |
| https://github.com/free5gc/free5gc/releases/tag/v4.2.2 | x_refsource_MISC |
Impacted products
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CVE-2026-33063 (GCVE-0-2026-33063)
Vulnerability from cvelistv5 – Published: 2026-03-20 02:53 – Updated: 2026-03-20 18:08
VLAI
EPSS
VEX
Title
free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-20 16:35 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/free5gc/free5gc/security/advis… | x_refsource_CONFIRM |
| https://github.com/free5gc/free5gc/issues/778 | x_refsource_MISC |
| https://github.com/free5gc/ausf/pull/52 | x_refsource_MISC |
| https://github.com/free5gc/ausf/commit/3b9ac4403c… | x_refsource_MISC |
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"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "CWE-476: NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-20T02:53:28.186Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-4jrw-92fg-4jwx",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-4jrw-92fg-4jwx"
},
{
"name": "https://github.com/free5gc/free5gc/issues/778",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/free5gc/free5gc/issues/778"
},
{
"name": "https://github.com/free5gc/ausf/pull/52",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/free5gc/ausf/pull/52"
},
{
"name": "https://github.com/free5gc/ausf/commit/3b9ac4403c2756dc89a5ed3cdcefe688458588aa",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/free5gc/ausf/commit/3b9ac4403c2756dc89a5ed3cdcefe688458588aa"
}
],
"source": {
"advisory": "GHSA-4jrw-92fg-4jwx",
"discovery": "UNKNOWN"
},
"title": "free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-33063",
"datePublished": "2026-03-20T02:53:28.186Z",
"dateReserved": "2026-03-17T19:27:06.343Z",
"dateUpdated": "2026-03-20T18:08:33.046Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}