CVE-2021-33831: api/account/register in the TH Wildau COVID-19 Contact Tracing application through 2021-09-01 has Incorrect Ac

Q: How do I fix CVE-2021-33831?

covid-19 contact tracing: upgrade to newer than 2021-09-01. Exact commands for each OS are on this page.

Q: Is CVE-2021-33831 being exploited?

CVE-2021-33831 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-33831 affect?

CVE-2021-33831 affects covid-19 contact tracing. Severity is medium (CVSS 6.5). api/account/register in the TH Wildau COVID-19 Contact Tracing application through 2021-09-01 has Incorrect Access Control. An attacker can interfere with tracing of infection chains by creating 500 random users within 2500 seconds.

Q: How urgent is CVE-2021-33831?

Priority 43/100. No elevated risk signals yet.

This month

MEDIUM 6.5UPGRADE

CVE-2021-33831 is a medium-severity flaw (CVSS 6.5) affecting covid-19 contact tracing. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

api/account/register in the TH Wildau COVID-19 Contact Tracing application through 2021-09-01 has Incorrect Access Control. An attacker can interfere with tracing of infection chains by creating 500 random users within 2500 seconds.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-770
Published	2021-09-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: th-wildau

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-07 06:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

th-wildau covid-19 contact tracing UPGRADE

Affected: <= 2021-09-01

Fixed in: newer than 2021-09-01

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy covid-19-contact-tracing || rpm -q covid-19-contact-tracing || covid-19-contact-tracing --version

2. UPGRADE to newer than 2021-09-01 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade covid-19-contact-tracing

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade covid-19-contact-tracing

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33831?

covid-19 contact tracing: upgrade to newer than 2021-09-01. Exact commands for each OS are on this page.

Is CVE-2021-33831 being exploited?

CVE-2021-33831 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33831 affect?

CVE-2021-33831 affects covid-19 contact tracing. Severity is medium (CVSS 6.5). api/account/register in the TH Wildau COVID-19 Contact Tracing application through 2021-09-01 has Incorrect Access Control. An attacker can interfere with tracing of infection chains by creating 500 random users within 2500 seconds.

How urgent is CVE-2021-33831?

Priority 43/100. No elevated risk signals yet.

References

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