What’s Vulnerable › Vulnerabilities

CVE-2020-24721

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-30 · updated 2026-06-17

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.

Affected products

• Apple Exposure Notifications: through 1.5
• Google Exposure Notifications: through 1.5

References

• http://packetstormsecurity.com/files/159419/Corona-Exposure-Notifications-API-Data-Leakage.html
• https://blog.google/inside-google/company-announcements/update-exposure-notifications
• https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/CVEs/CVE-2020-24721.txt
• https://seclists.org/fulldisclosure/2020/Sep/53
• http://packetstormsecurity.com/files/159419/Corona-Exposure-Notifications-API-Data-Leakage.html
• https://blog.google/inside-google/company-announcements/update-exposure-notifications
• https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/CVEs/CVE-2020-24721.txt
• https://seclists.org/fulldisclosure/2020/Sep/53

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