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CVE-2021-33831

22
FAUCET Score

CVE-2021-33831 describes an Incorrect Access Control vulnerability in the TH Wildau COVID-19 Contact Tracing application, specifically within the api/account/register endpoint. An attacker can exploit this flaw to create numerous random user accounts, potentially disrupting the accuracy and effectiveness of infection chain tracing. This vulnerability carries a CVSS score of 6.5 (Medium), indicating it can be exploited over the network with low attack complexity and requires low privileges, leading to high availability impact by interfering with the application's intended function. Currently, there is no evidence of active exploitation, no public exploit code available (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2021-09-01CPE matchmatch criteria
cpe:2.3:a:th-wildau:covid-19_contact_tracing:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.02%
Probability of exploitation in next 30 days
EPSS Percentile
78.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0202 is in the 91st percentile among its peer group of 21,974 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

github.com / lanmarc77/CVE-2021-33831
Third Party Advisory
th-wildau.de / studieren-weiterbilden/neuigkeiten-und-veranstaltungen/corona
Vendor Advisory