CVE-2021-40855

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-21 · updated 2026-06-17
Weakness: CWE-295

Description

The EU Technical Specifications for Digital COVID Certificates before 1.1 mishandle certificate governance. A non-production public key certificate could have been used in production.

Affected products

Europa Technical Specifications For Digital Covid Certificates: before 1.1 — fixed in 1.1

How to fix

Upgrade to a fixed version: Europa Technical Specifications For Digital Covid Certificates 1.1. Check the vendor advisory for mitigations.

References

https://github.com/eu-digital-green-certificates/dgc-overview/security/advisories/GHSA-xcvc-p4fw-qmcj
https://www.consilium.europa.eu/en/policies/coronavirus/eu-digital-covid-certificate/
https://github.com/eu-digital-green-certificates/dgc-overview/security/advisories/GHSA-xcvc-p4fw-qmcj
https://www.consilium.europa.eu/en/policies/coronavirus/eu-digital-covid-certificate/

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