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CVE-2020-10185

HIGH
8.6
CVSS Score
Published: March 5, 2020 at 10:48 PM UTC
Updated: June 17, 2026 at 02:47 AM UTC
1 product affected across 1 vendorYubikey One Time Password Validation Server

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Severity
HIGH8.6
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Yubikey One Time Password Validation Server· Yubico
95%
v < 2.40
Affected range stops below 2.40, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/Yubico/yubikey-val/releases/tag/yubikey-val-2.40
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/03/msg00014.html
x_refsource_MISCExploitVendor Advisory
Source: [email protected]
https://www.yubico.com/support/security-advisories/ysa-2020-01/

CVSS

8.6HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-294

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