CVE-2025-15539

Open5GS sgwc s11-handler.c sgwc_s11_handle_downlink_data_notification_ack denial of service

HIGH
7.5
CVSS Score
Published: January 18, 2026 at 11:32 PM UTC
Updated: June 17, 2026 at 08:37 AM UTC
1 product affected across 1 vendorOpen5GS

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (7)

VDB EntryTechnical DescriptionThird Party Advisory
Source: cverecord
https://vuldb.com/?id.341732
SignaturePermissions RequiredVDB Entry
Source: cverecord
https://vuldb.com/?ctiid.341732
Third Party AdvisoryVDB Entry
Source: cverecord
https://vuldb.com/?submit.735339
Issue TrackingExploitVendor Advisory
Source: cverecord
https://github.com/open5gs/open5gs/issues/4230
ExploitIssue TrackingVendor Advisory
Source: cverecord
https://github.com/open5gs/open5gs/issues/4230#issue-3774173079
Product
Source: cverecord
https://github.com/open5gs/open5gs/

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-404

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