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CVE-2021-28122

30
FAUCET Score

CVE-2021-28122 is a critical request-validation vulnerability in Open5GS versions 2.1.3 through 2.2.0, allowing unauthenticated attackers to manipulate the subscriber database via crafted HTTP API requests due to improper Express configuration. With a CVSS score of 9.8, this vulnerability presents a severe risk, enabling full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H) without requiring any user interaction or privileges. While no active exploitation, public exploit code, or significant community discussion has been observed, the high FAUCET Risk Score of 80/100 indicates its potential for severe impact.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.1.3, <= 2.2.0CPE matchmatch criteria
cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.96%
Probability of exploitation in next 30 days
EPSS Percentile
89.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0396 is in the 82nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / open5gs/open5gs/compare/v2.2.0...v2.2.1
PatchThird Party Advisory
github.com / open5gs/open5gs/issues/837
ExploitThird Party Advisory
github.com / open5gs/open5gs/pull/838
PatchThird Party Advisory
github.com / open5gs/open5gs/releases
Release NotesThird Party Advisory