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CVE-2025-15539— Open5GS sgwc s11-handler.c sgwc_s11_handle_downlink_data_notification_ack 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src/sgwc/s11-handler.c文件中sgwc_s11_handle_downlink_data_notification_ack函数存在缺陷，可能导致远程拒绝服务攻击。

CVSS 5.3 · Medium EPSS 0.74% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-15539

Vulnerability Information
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Vulnerability Title
Open5GS sgwc s11-handler.c sgwc_s11_handle_downlink_data_notification_ack denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in Open5GS up to 2.7.6. Impacted is the function sgwc_s11_handle_downlink_data_notification_ack of the file src/sgwc/s11-handler.c of the component sgwc. This manipulation causes denial of service. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: b4707272c1caf6a7d4dca905694ea55557a0545f. To fix this issue, it is recommended to deploy a patch. The issue report is flagged as already-fixed.
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src/sgwc/s11-handler.c文件中sgwc_s11_handle_downlink_data_notification_ack函数存在缺陷，可能导致远程拒绝服务攻击。
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-2025-15539

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III. Intelligence Information for CVE-2025-15539

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Vendor Advisories for CVE-2025-15539 (1)

Same Patch Batch · n/a · 2026-01-18 · 3 CVEs total

CVE-2026-1107 6.3 MEDIUM EyouCMS Member Avatar Diyajax.php check_userinfo unrestricted upload
CVE-2025-15537 5.3 MEDIUM Mapnik dbfile.cpp string_value heap-based overflow

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-15539

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