CVE-2020-10184Network attack vector

Unauthenticated service interruption via oversized verify input

Published Mar 5, 2020 · Updated Aug 4, 2024

SQL injection in Yubico YubiKey Validation Server before 2.40 allows remote attackers to interrupt OTP validation via oversized requests. The verify endpoint validates field formats but fails to limit field lengths before incorporating submitted values into database queries. This endpoint is exposed without an IP allowlist by default, so exploitation can block legitimate authentications on self-hosted services; YubiCloud is unaffected.

CVSS severity7.5
High
EPSS probability1.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Yubico YubiKey Validation Server before 2.40 allows remote attackers to interrupt OTP validation via oversized requests. The verify endpoint validates field formats but fails to limit field lengths before incorporating submitted values into database queries. This endpoint is exposed without an IP allowlist by default, so exploitation can block legitimate authentications on self-hosted services; YubiCloud is unaffected.

The record

CVE
CVE-2020-10184
Published
Mar 5, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 5, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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