PatchTheCVECVE-2020-24722: An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as
CVE-2020-24722 is a medium-severity flaw (CVSS 5.9) affecting exposure notifications, exposure notifications. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.5% (top 16%) |
| CISA exploited list | No |
| Weakness | CWE-294 |
| Published | 2020-10-07 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-24722?
exposure notifications: upgrade to newer than 2020-10-05; exposure notifications: upgrade to newer than 2020-10-05. Exact commands for each OS are on this page.
Is CVE-2020-24722 being exploited?
CVE-2020-24722 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-24722 affect?
CVE-2020-24722 affects exposure notifications, exposure notifications. Severity is medium (CVSS 5.9). 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 bitflipp
How urgent is CVE-2020-24722?
Priority 52/100. Public exploit reference; Remotely exploitable, no login, no user action
Software pages
Android vulnerabilities · iOS vulnerabilities
Related CVEs
- CVE-2020-24721 MEDIUM 5.7 UPGRADE UPGRADE An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as