CVE-2020-10185
CVSS v3
8.6
HIGH
EPSS Score
1.5 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.
Technical details
- Published
- 2020-03-05
Frequently asked questions
What is CVE-2020-10185?
The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.
Is CVE-2020-10185 actively exploited?
Active exploitation of CVE-2020-10185 has not been confirmed. Its EPSS score was 1.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2020-10185?
CVE-2020-10185 has a CVSS v3 base score of 8.6 (HIGH severity).
Is CVE-2020-10185 affecting your environment?
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