Medium severity5.9NVD Advisory· Published Oct 7, 2020· Updated Jun 17, 2026
CVE-2020-24722
CVE-2020-24722
Description
An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor's position is "We do not believe that TX power authentication would be a useful defense against relay attacks.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*+ 1 more
- cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*range: <=2020-10-05
- cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*range: <=2020-10-05
- Google/Apple/Exposure Notifications protocoldescription
- Range: <=2020-10-05
- Range: <=2020-10-05
Patches
Vulnerability mechanics
References
4- packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.htmlnvdExploitThird Party AdvisoryVDB Entry
- seclists.org/fulldisclosure/2020/Oct/12nvdExploitMailing ListThird Party Advisory
- blog.google/inside-google/company-announcements/update-exposure-notificationsnvdThird Party Advisory
- github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.mdnvdThird Party Advisory
News mentions
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