Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-4240— Open5GS CCA smf_s6b_sta_cb denial of service

Quick assessment

Affected
n/a Open5GS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.3 · Medium EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-4240

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Open5GS CCA smf_s6b_sta_cb denial of service
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
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

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-4240

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-4240 (2)

Vendor Advisories for CVE-2026-4240 (3)

Vendor Pages for CVE-2026-4240 (1)

Same Patch Batch · n/a · 2026-03-16 · 21 CVEs total

CVE-2026-4234 6.3 MEDIUM SSCMS DDL SitesAddController.Submit.cs sql injection
CVE-2026-4233 4.3 MEDIUM ThingsGateway download path traversal
CVE-2026-4222 3.8 LOW SSCMS download PathUtils.RemoveParentPath path traversal
CVE-2026-4218 2.5 LOW myAEDES App aedes.me.beta EngageBayUtils.java information disclosure
CVE-2026-4243 2.5 LOW La Nacion App app.lanacion.activity BuildConfig.java credentials storage
CVE-2026-4225 2.4 LOW CMS Made Simple User Management listusers.php cross site scripting
CVE-2025-69902 kubectl-mcp-server 安全漏洞
CVE-2025-50881 ITFlow 安全漏洞
CVE-2025-68971 Forgejo 安全漏洞
CVE-2025-69693 ffmpeg 安全漏洞
CVE-2025-69768 Chyrp 安全漏洞
CVE-2025-69808 bareiron 安全漏洞
CVE-2025-69809 bareiron 安全漏洞
CVE-2025-69727 INDEX ÉDUCATION PRONOTE 安全漏洞
CVE-2025-66687 Doom Launcher 安全漏洞
CVE-2025-65734 GUnet OpenEclass 安全漏洞
CVE-2026-30405 GoBGP 安全漏洞
CVE-2025-69783 OpenEDR 安全漏洞
CVE-2025-69784 OpenEDR 安全漏洞
CVE-2025-57543 NetBox 安全漏洞

IV. Related Vulnerabilities

Same product: Open5GS
Same vendor: n/a
Same weakness: CWE-404

V. Comments for CVE-2026-4240

No comments yet

Leave a comment