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CVE-2020-24721

21
FAUCET Score

CVE-2020-24721 describes a vulnerability in the Google/Apple Exposure Notifications (GAEN) protocol, affecting COVID-19 contact tracing applications on both Android and iOS. This medium-severity vulnerability (CVSS 5.7) allows for coercion, where a user can be forced to prove or disprove an exposure notification due to the persistent state of a private framework. The attack vector is physical, with low complexity, requiring user interaction, and resulting in high confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.5CPE matchmatch criteria
cpe:2.3:a:apple:exposure_notifications:*:*:*:*:*:iphone_os:*:*
<= 1.5CPE matchmatch criteria
cpe:2.3:a:google:exposure_notifications:*:*:*:*:*:android:*:*

CVSS Data

CVSS version used by this source: 3.1

5.7MEDIUM

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

Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
0.5
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.32%
Probability of exploitation in next 30 days
EPSS Percentile
24.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0032 is in the 71st percentile among its peer group of 8 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/159419/Corona-Exposure-Notifications-API-Data-Leakage.html
Third Party AdvisoryVDB Entry
blog.google / inside-google/company-announcements/update-exposure-notifications
Vendor Advisory
github.com / minvws/nl-covid19-notification-app-coordination/blob/master/CVEs/CVE-2020-24721.txt
Third Party Advisory
seclists.org / fulldisclosure/2020/Sep/53
Mailing ListThird Party Advisory