CVE-2026-2521

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

0.68% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 49.7% 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

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

2026-02-15 23:02Z6 MO AGO

Last updated

2026-02-23 10:02Z6 MO AGO

Reserved

2026-02-15

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-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.2

Document digest

57bfb3547c7f20dc49e39042c261888517e92eeea0a0af857c3ec04a4793408e

• vuldb.comVDB-346109 | Open5GS SGW-C sgwc_s5c_handle_create_session_response memory corruptionhttps://vuldb.com/?id.346109vdb-entrytechnical-description
• vuldb.comVDB-346109 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/?ctiid.346109signaturepermissions-required
• vuldb.comSubmit #738334 | Open5GS SGWC v2.7.6 Buffer Overflowhttps://vuldb.com/?submit.738334third-party-advisory
• github.comhttps://github.com/open5gs/open5gs/issues/4282issue-tracking
• github.comhttps://github.com/open5gs/open5gs/issues/4282#issue-3807902188exploitissue-tracking
• github.comhttps://github.com/open5gs/open5gs/product