Open5GS up to 2.7.7 NSSF /lib/sbi/conv.c ogs_sbi_parse_plmn_list denial of service

CVSS Meta Temp Score
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CTI Interest Score
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3.9$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Open5GS up to 2.7.7. This affects the function ogs_sbi_parse_plmn_list in the library /lib/sbi/conv.c of the component NSSF. The manipulation results in denial of service. This vulnerability was named CVE-2026-8121. The attack may be performed from remote. In addition, an exploit is available. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability classified as problematic has been found in Open5GS up to 2.7.7. Affected is the function ogs_sbi_parse_plmn_list in the library /lib/sbi/conv.c of the component NSSF. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-8121. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1499.

The exploit is shared for download at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202605-1871). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.9

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/07/2026 Advisory disclosed
05/07/2026 +0 days VulDB entry created
05/10/2026 +3 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 4433
Status: Not defined

CVE: CVE-2026-8121 (🔒)
GCVE (CVE): GCVE-0-2026-8121
GCVE (VulDB): GCVE-100-361908
CNNVD: CNNVD-202605-1871 - Open5GS 安全漏洞

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/07/2026 19:02
Updated: 05/10/2026 16:39
Changes: 05/07/2026 19:02 (57), 05/09/2026 14:29 (6), 05/10/2026 16:39 (1)
Complete: 🔍
Submitter: FrankyLin
Cache ID: 216::103

Submitinfo

Accepted

Duplicate

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