CVE-2026-8121

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.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• 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

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 31.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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

Analyzed. 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

2026-05-08 00:30Z3 MO AGO

Last updated

2026-05-08 14:12Z3 MO AGO

Reserved

2026-05-07

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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

90911bf7430bd3f51d35a2ca66734505d1651207cf68d2a9d813b8d25fa13f06

• vuldb.comVDB-361908 | Open5GS NSSF conv.c ogs_sbi_parse_plmn_list denial of servicehttps://vuldb.com/vuln/361908vdb-entrytechnical-description
• vuldb.comVDB-361908 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/361908/ctisignaturepermissions-required
• vuldb.comSubmit #808422 | Open5gs NSSF v2.7.7 Denial of Servicehttps://vuldb.com/submit/808422third-party-advisory
• vuldb.comSubmit #808424 | Open5gs NSSF v2.7.7 Denial of Service (Duplicate)https://vuldb.com/submit/808424third-party-advisory
• github.comhttps://github.com/open5gs/open5gs/issues/4433exploitissue-tracking
• github.comhttps://github.com/open5gs/open5gs/product