CVE-2021-22565
Insufficient Granularity of Access Control in GAEN Notification Server
An attacker could prematurely expire a verification code, making it unusable by the patient, making the patient unable to upload their TEKs to generate exposure notifications. We recommend upgrading the Exposure Notification server to V1.1.2 or greater.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Insufficient Granularity of Access Control in GAEN Notification Server
An attacker could prematurely expire a verification code, making it unusable by the patient, making the patient unable to upload their TEKs to generate exposure notifications. We recommend upgrading the Exposure Notification server to V1.1.2 or greater.
- Record
CVE-2021-22565- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2021-2409
An attacker could prematurely expire a verification code, making it unusable by the patient, making the patient unable to upload their TEKs to generate exposure notifications. We recommend upgrading the Exposure Notification server to V1.1.2 or greater.
- Record
EUVD-2021-2409- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wx8q-rgfr-cf6v
Insufficient Granularity of Access Control in github.com/google/exposure-notifications-verification-server
Impact
Users or API keys with permission to expire verification codes could have expired codes that belonged to another realm if they guessed the UUID.
Patches
v1.1.2+
Workarounds
There are no workarounds, and there are no indications this has been exploited in the wild. Verification codes can only be expired by providing their 64-bit UUID, and verification codes are already valid for a very short period of time (thus the UUID rotates frequently).
For more information
Contact [email protected]
- Record
GHSA-wx8q-rgfr-cf6v- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
An attacker could prematurely expire a verification code, making it unusable by the patient, making the patient unable to upload their TEKs to generate exposure notifications. We recommend upgrading the Exposure Notification server to V1.1.2 or greater.
- Record
CVE-2021-22565- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:P - Weakness
- CWE-284
- Updated
- 2026-11-02
OSV
An attacker could prematurely expire a verification code, making it unusable by the patient, making the patient unable to upload their TEKs to generate exposure notifications. We recommend upgrading the Exposure Notification server to V1.1.2 or greater.
- Record
CVE-2021-22565- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
OSVGHSA-wx8q-rgfr-cf6v
Insufficient Granularity of Access Control in github.com/google/exposure-notifications-verification-server
Impact
Users or API keys with permission to expire verification codes could have expired codes that belonged to another realm if they guessed the UUID.
Patches
v1.1.2+
Workarounds
There are no workarounds, and there are no indications this has been exploited in the wild. Verification codes can only be expired by providing their 64-bit UUID, and verification codes are already valid for a very short period of time (thus the UUID rotates frequently).
For more information
Contact [email protected]
- Record
GHSA-wx8q-rgfr-cf6v- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-284
- Updated
- 2026-11-02
OSVGO-2022-0270 No score
Insufficient Granularity of Access Control in github.com/google/exposure-notifications-verification-server
Insufficient Granularity of Access Control in github.com/google/exposure-notifications-verification-server
- Record
GO-2022-0270- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/google/exposure-notifications-verification-serverGo |
before 1.1.2 | 1.1.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-22565 is a medium vulnerability (CVSS 6.5) in Google Exposure Notification Verification Server, published November 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.44%, the 38th percentile. Fixed in github.com/google/exposure-notifications-verification-server 1.1.2.
References
github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-wx8q-rgfr-cf6v
nvd.nist.gov/vuln/detail/CVE-2021-22565