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Here you can find all important information about the Corona-Warn-App open source project. For further information you can also check the frequently asked questions about the Corona-Warn-App.

Corona-Warn-App version 1.11 comes this week providing statistics on infection numbers in Germany

Hanna Heine on January 25, 2021

With the next update to version 1.11, the Corona-Warn-App will contain some bug fixes and improvements, as well as statistics that give an overview of current key figures on the infection numbers in Germany.

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Current facts and figures - an interim balance

Janina Hoerdt on January 22, 2021

In this post, you can find regularly updated facts and figures about the Corona-Warn-App, the connection to laboratories, as well as the number of transmitted test results.

Overview of previous facts and figures

(German versions only)



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Problem with key matching on Android is fixed

Hanna Heine on January 14, 2021

Google has released a fix to solve the key matching issue on Android smartphones. By now, the Corona-Warn-App should be working again on the affected devices. Google assured in a statement that the issue did neither lead to loss of data nor potential exposures:

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Corona-Warn-App not able to perform key matching on Android smartphones in some cases

Hilmar Schepp on January 13, 2021

Currently, the Corona-Warn-App is not able to perform key matching on Android smartphones in some cases. This is due to the Exposure Notification Framework under the Google smartphone operating system. The project team has informed Google about the problem and is working together with them under high pressure to solve the issue.

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Behind the scenes of the Corona-Warn-App

Hanna Heine on December 30, 2020

The Corona-Warn-App is a useful, digital tool that warns users of high-risk encounters during the pandemic. The processes in the background, however, remain more or less invisible to most users. In a livestream for the virtual Chaos Communication Congress (rC3), Thomas Klingbeil, SAP Solution Architect for the Corona-Warn-App, explains how the app works in the backend.

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Corona-Warn-App version 1.10 with contact journal is available

Hanna Heine on December 28, 2020

The next update of the Corona-Warn-App is ready and will be available for download in the next 48 hours. The most important innovation in version 1.10 of the Corona-Warn-App is a contact journal. Users can use the app to voluntarily note the people they’ve met and places they’ve visited. This is important information for the health department and for tracing infection chains. However, it is difficult to recall that information over a time period of two weeks so the contact journal serves as a useful memory aid.

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Corona-Warn-App version 1.10 comes with an integrated contact journal

Hanna Heine on December 24, 2020

The next update of the Corona-Warn-App (version 1.10) will include a contact journal, where users can note the names of people they’ve met and locations they’ve visited.

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Risk calculation under Exposure Notification Framework Version 2

Hanna Heine on December 17, 2020

Previously, the Corona-Warn-App displayed one or more low risk encounters. Since the update, these have disappeared or rather the number decreased, because the risk calculation improved significantly under Version 2 of the Exposure Notification Framework (ENF). With the interface's new version, it is now possible to control more precisely which encounters should be counted.

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Corona-Warn-App Version 1.9 to use version 2 of the Exposure Notification Framework

Hanna Heine on December 16, 2020

Over the next 48 hours, the Corona-Warn-App's new version will be rolled out to all devices. Version 1.9 uses the updated version of the Exposure Notification Framework (ENF) provided by Apple and Google. The two companies have evolved the framework so that more precise pseudonymous information about encounters can be provided.

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Telekom and SAP to make Corona Warn app available for iOS 12.5

Hilmar Schepp on December 15, 2020

Apple now makes its Exposure Notification Framework available for the iOS 12.5 operating system version as well

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Corona-Warn-App Version 1.7 can perform the exposure check several times a day

Hanna Heine on November 25, 2020

Corona-Warn-App Version 1.7 is now available in the Google Play Store and Apple’s App Store. With the update, the exposure check can be run several times a day. In addition, users who have tested positive will now receive a reminder if they haven’t shared their test result.

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Security update for Corona-Warn-App-Server

Janina Hoerdt on November 19, 2020

The development team of the Corona-Warn-App was notified by a GitHub Security Lab employee about a vulnerability in the Corona-Warn-App-Server (CWA-Server, Version 1.5). The team closed this vulnerability with version 1.5.1 of the server four days after it was announced. The current version is 1.6.0.

This quickly implemented removal of the vulnerability clearly shows that the open source and community process works flawlessly and significantly contributes to the security of the operation of the Corona-Warn-App.

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Corona-Warn-App Update: Version 1.6 explains change of risk status

Hanna Heine on November 11, 2020

We have updated the Corona-Warn-App to version 1.6, which is now available in Apple's App Store and the Google Play Store. Version 1.6 provides more detailed explanations about the change in risk status. A short-term problem with regard to the exposure check has already been resolved with version 1.6.1.

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New features: Corona-Warn-App Version 1.5 is now available for download

Janina Hoerdt on October 19, 2020

A new update for the Corona-Warn-App is now available in both the Google Play Store and the Apple App Store. Version 1.5 of the App introduces new features such as symptom detection or support of the European Corona App gateway. In addition, some "bugs" have been fixed and further improvements are delivered.

Note for iOS users: Version 1.5 of the app requires at least iOS version 13.6. So please check if your phone is on iOS 13.6 or higher before you update the app to the new app version 1.5.

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A positive summary after 100 days

Hanna Heine on September 23, 2020

The developers at SAP and Deutsche Telekom regard the first 100 days since the Corona-Warn-App’s launch as a success. Since its release on June 16, the app has been downloaded more than 18.3 million times. This high number of downloads compared to other European countries shows that the population is giving the app a chance and is willing to use an intelligent technology to fight the spread of the pandemic.

In this document (German only), based on the current data status, you will find further facts and figures about the Corona-Warn-App, the laboratory connection and the test results transmitted.

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Problem in connection with iOS 13.7 fixed

Hanna Heine on September 17, 2020

In close cooperation with Apple, the developers could fix the problem in Apple’s iOS 13.7 operating system that was identified a few days ago. Affected users should now receive a correctly calculated risk assessment under iOS 13.7 again. The adjustments were made directly on the server. This means that the Corona-Warn-App does not have to be updated and users do not have to do anything

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What requirements must be met in order for a personal test result to be successfully transmitted via the Corona-Warn-App?

Janina Hoerdt on September 11, 2020

In order to ensure that users receive their test results via the Corona-Warn-App, the following points are important:

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Problems with iOS 13.7

Janina Hoerdt on September 10, 2020

During the course of regular tests on the Corona warning app, developers today discovered a problem in the Apple operating system iOS 13.7, relating to the determination of the risk values. The iOS version released by Apple on September 1 may lead to confusing risk calculations for a small number of users. In some cases, the app may show some users that they were exposed to a higher risk than was actually the case.

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Corona-Warn-App Version 1.3 brings improvements and new features

Hanna Heine on September 4, 2020

We have updated the Corona-Warn-App to version 1.3, which is available for download in Apple's App Store and Google Play Store. The latest version includes a number of enhancements, such as improved texts for the risk status and test results as well as clearer messages when scanning QR codes.

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QR Code scanned but no test result in the Corona-Warn-App

Janina Hoerdt on August 25, 2020

The Corona-Warn-App has been active for a few weeks now and has been downloaded over 17.6 million times. An essential part of the app is the QR code procedure, which allows tested users to report test results to the app pseudonymously.

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Note on the study by the Irish Trinity College

Hanna Heine on August 19, 2020

Fraunhofer IIS has conducted numerous tests of the interface vis-a-vis Google and Apple (so-called exposure notification interface) and discussed the results with SAP, Deutsche Telekom and the RKI to adjust the app’s configuration.

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Corona-Warn-App version 1.2.1 available in Google Play Store

Hanna Heine on August 14, 2020

Version 1.2.1 of the Corona-Warn-App has been released in the Google Play Store. The update corrects the misleading sentence that the probability of infection is ranked as 'increased' even though the risk of infection is, in fact, low. Therefore, we recommend all Android users to install version 1.2.1 of the Corona-Warn-App.

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Upgrade to iOS 13.6.1 improves interaction with the Corona-Warn-App

Hanna Heine on August 13, 2020

We recommend iOS users to upgrade the operating system to iOS 13.6.1 as it improves interaction with the Corona-Warn-App.

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Corona-Warn-App version 1.2.1 is available in the App Store for iOS devices

Hanna Heine on August 12, 2020

Version 1.2.1 of the Corona-Warn-App has been released in the Apple App Store. The update fixes an error which caused the app to crash or prevented some users from opening the app. Therefore, we recommend all iOS-users to update the app to version 1.2.1.

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