Home/CVE/A vulnerability was determined in Open5GS up to 2.7.6. The affected element is the function smf_gx_cca_cb/smf_gy_cca_cb/
CVE

CVE-2026-4240

A vulnerability was determined in Open5GS up to 2.7.6. The affected element is the function smf_gx_cca_cb/smf_gy_cca_cb/

A vulnerability was determined in Open5GS up to 2.7.6. The affected element is the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b_aaa_cb/smf_s6b_sta_cb of the component CCA Handler. This manipulation causes denial of service.

The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.7.7 is sufficient to fix this issue.

Patch name: 80eb484a6ab32968e755e628b70d1a9c64f012ec. Upgrading the affected component is recommended.

MEDIUM · CVSS 5.3 EPSS 0.001
Schedule remediation
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-404Improper Resource Shutdown or Release
▤

Affected Products & Versions

1
open5gs< 2.7.7
⚠

Public Exploits & PoCs

2
pocgithub.com · 4343#issue-4021871895github.com
pocvuldb.com · ?submit.771361vuldb.com
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cna@vuldb.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Mar 2026 · 02:20 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/open5gs/open5gs/Product
https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ecPatch
https://github.com/open5gs/open5gs/issues/4343Issue TrackingThird Party Advisory
https://github.com/open5gs/open5gs/releases/tag/v2.7.7Release Notes
https://vuldb.com/?ctiid.351182Permissions RequiredVDB Entry
https://vuldb.com/?id.351182Third Party AdvisoryVDB Entry
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