CVE-2020-24721

Name: CVE-2020-24721
Creator: NVD / NIST
Published: 2020-09-30T18:15:25.193+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.7/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2020-24721 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as used in COVID-19 applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or disproving an exposure notification, because of the persistent state of a private framework.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as used in COVID-19 applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or disproving an exposure notification, because of the persistent state of a private framework.

Metrics

CVSS 3.1

5.7/10

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

EPSS Probability

0.32%

23.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Apple	Exposure Notifications	<= 1.5
Google	Exposure Notifications	<= 1.5

References

http://packetstormsecurity.com/files/159419/Corona-Exposure-Notifications-API-Data-Leakage.htmlThird Party Advisory, VDB Entry
https://blog.google/inside-google/company-announcements/update-exposure-notificationsVendor Advisory
https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/CVEs/CVE-2020-24721.txtThird Party Advisory
https://seclists.org/fulldisclosure/2020/Sep/53Mailing List, Third Party Advisory
http://packetstormsecurity.com/files/159419/Corona-Exposure-Notifications-API-Data-Leakage.htmlThird Party Advisory, VDB Entry
https://blog.google/inside-google/company-announcements/update-exposure-notificationsVendor Advisory
https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/CVEs/CVE-2020-24721.txtThird Party Advisory
https://seclists.org/fulldisclosure/2020/Sep/53Mailing List, Third Party Advisory

Timeline

Published: Sep 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-24721?

How severe is CVE-2020-24721?

CVE-2020-24721 has a CVSS score of 5.7/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24721?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-24721?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST