CVE-2026-4240— Open5GS CCA smf_s6b_sta_cb denial of service
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I. Basic Information for CVE-2026-4240
Vulnerability Information
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Vulnerability Title
Open5GS CCA smf_s6b_sta_cb denial of service
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability was determined in Open5GS up to 2.7.6. The affected element is the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b_aaa_cb/smf_s6b_sta_cb of the component CCA Handler. This manipulation causes denial of service. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.7.7 is sufficient to fix this issue. Patch name: 80eb484a6ab32968e755e628b70d1a9c64f012ec. Upgrading the affected component is recommended.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
不恰当的资源关闭或释放
Source: NVD (National Vulnerability Database)
Vulnerability Title
Open5GS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open5GS是Open5GS开源的一个 5G Core 和 Epc 的 C 语言开源实现，即 Lte/Nr 网络的核心网络。 Open5GS 2.7.6及之前版本存在安全漏洞，该漏洞源于对组件CCA Handler的函数smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b_aaa_cb/smf_s6b_sta_cb的操作不当，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | Open5GS | 2.7.0 | cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:* |
II. Public POCs for CVE-2026-4240
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- CVE-2026-4240 Open5GS CCA smf_s6b_sta_cb denial of service (Issue 4343)vdb-entrytechnical-description
- Submit #771361: Open5GS MME v2.7.6 Improper Authenticationthird-party-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-4240
Same Patch Batch · n/a · 2026-03-16 · 21 CVEs total
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| CVE-2026-4218 | 2.5 LOW | myAEDES App aedes.me.beta EngageBayUtils.java information disclosure |
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| CVE-2026-4225 | 2.4 LOW | CMS Made Simple User Management listusers.php cross site scripting |
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| CVE-2025-69783 | OpenEDR 安全漏洞 | |
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IV. Related Vulnerabilities
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Same vendor: n/a
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Open5GS SMF ogs_nas_parse_qos_rules denial of service - CVE-2026-8269
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Open5GS SMF OpenAPI_list_create denial of service
Same weakness: CWE-404
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Open5GS SMF ogs_nas_parse_qos_rules denial of service - CVE-2026-8269
Open5GS SMF smf_nsmf_handle_create_sm_context denial of serv - CVE-2026-8268
Open5GS SMF OpenAPI_list_create denial of service - CVE-2026-8267
Open5GS SMF smf_nsmf_handle_created_data_in_vsmf denial of s - CVE-2026-8266
Open5GS SMF gsm-build.c gsm_build_pdu_session_establishment_
V. Comments for CVE-2026-4240
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