CVE-2025-15539

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.70% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 50.3% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-01-18 23:32Z7 MO AGO

Last updated

2026-02-23 08:42Z6 MO AGO

Reserved

2026-01-18

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-404Improper Resource Shutdown or ReleaseClass

Data version

5.2

Document digest

9168044e150c789a307751dd000fa5b10460aedde69fffd0845bc53d7e53bffb

• vuldb.comVDB-341732 | Open5GS sgwc s11-handler.c sgwc_s11_handle_downlink_data_notification_ack denial of servicehttps://vuldb.com/?id.341732vdb-entrytechnical-description
• vuldb.comVDB-341732 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/?ctiid.341732signaturepermissions-required
• vuldb.comSubmit #735339 | Open5GS SGWC v2.7.6 Denial of Servicehttps://vuldb.com/?submit.735339third-party-advisory
• github.comhttps://github.com/open5gs/open5gs/issues/4230issue-tracking
• github.comhttps://github.com/open5gs/open5gs/issues/4230#issue-3774173079exploitissue-tracking
• github.comhttps://github.com/open5gs/open5gs/commit/b4707272c1caf6a7d4dca905694ea55557a0545fpatch
• github.comhttps://github.com/open5gs/open5gs/product