HOMEVULNERABILITIESCVE-2021-28122
CRITICAL

CVE-2021-28122

CWE-306Published: March 10, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-28122 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

open5gs1 product(s)
open5gs
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/open5gs/open5gs/compare/v2.2.0...v2.2.1
PATCHhttps://github.com/open5gs/open5gs/pull/838
PATCHhttps://github.com/open5gs/open5gs/compare/v2.2.0...v2.2.1
PATCHhttps://github.com/open5gs/open5gs/pull/838
ADVISORYhttps://github.com/open5gs/open5gs/issues/837
ADVISORYhttps://github.com/open5gs/open5gs/releases
ADVISORYhttps://github.com/open5gs/open5gs/issues/837
ADVISORYhttps://github.com/open5gs/open5gs/releases

All References (8)

→
https://github.com/open5gs/open5gs/compare/v2.2.0...v2.2.1Patch · Third Party Advisory
→
https://github.com/open5gs/open5gs/issues/837Exploit · Third Party Advisory
→
https://github.com/open5gs/open5gs/pull/838Patch · Third Party Advisory
→
https://github.com/open5gs/open5gs/releasesRelease Notes · Third Party Advisory
→
https://github.com/open5gs/open5gs/compare/v2.2.0...v2.2.1Patch · Third Party Advisory
→
https://github.com/open5gs/open5gs/issues/837Exploit · Third Party Advisory
→
https://github.com/open5gs/open5gs/pull/838Patch · Third Party Advisory
→
https://github.com/open5gs/open5gs/releasesRelease Notes · Third Party Advisory

Quick Facts

CVE IDCVE-2021-28122
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-306
CISA KEVNo
Affected1 vendor(s)
PublishedMar 10, 2021

Related CVEs (CWE-306)

CVE-2024-42017
10.0
CVE-2025-69425
10.0
CVE-2024-48966
10.0
CVE-2025-58083
10.0
CVE-2025-55108
10.0
CVE-2026-3611
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-28122 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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