How severe is CVE-2021-28122?

CVE-2021-28122 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28122 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28122?

CVE-2021-28122 affects Open5gs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28122?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-28122 published?

CVE-2021-28122 was published on 2021-03-10 and last updated on 2026-06-17.

CVE-2021-28122

CVE-2021-28122 is a critical-severity vulnerability in Open5gs with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Open5gs
Published: 2021-03-10
Last modified: 2026-06-17

Description

A request-validation issue was discovered in Open5GS 2.1.3 through 2.2.x before 2.2.1. The WebUI component allows an unauthenticated user to use a crafted HTTP API request to create, read, update, or delete entries in the subscriber database. For example, new administrative users can be added. The issue occurs because Express is not set up to require authentication.

Frequently asked questions

What is CVE-2021-28122?: A request-validation issue was discovered in Open5GS 2.1.3 through 2.2.x before 2.2.1. The WebUI component allows an unauthenticated user to use a crafted HTTP API request to create, read, update, or delete entries in the subscriber database. For example, new administrative users can be added. The issue occurs because Express is not set up to require authentication.
How severe is CVE-2021-28122?: CVE-2021-28122 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28122 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28122?: CVE-2021-28122 affects Open5gs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28122?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-28122 published?: CVE-2021-28122 was published on 2021-03-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

More vulnerabilities in Open5gs

CVE-2024-40130 — Critical (CVSS 9.8): open5gs v2.6.4 is vulnerable to Buffer Overflow. via /lib/core/abts.c.
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CVE-2021-25863 — High (CVSS 8.8): Open5GS 2.1.3 listens on 0.0.0.0:3000 and has a default password of 1423 for the admin account.
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