How severe is CVE-2020-15001?

CVE-2020-15001 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-15001 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15001?

CVE-2020-15001 affects Yubico Yubikey 5 Nfc Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15001?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-15001 published?

CVE-2020-15001 was published on 2020-07-09 and last updated on 2026-06-17.

CVE-2020-15001

CVE-2020-15001 is a medium-severity vulnerability in Yubico Yubikey 5 Nfc Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 2.9
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Yubico Yubikey 5 Nfc Firmware
Published: 2020-07-09
Last modified: 2026-06-17

Description

An information leak was discovered on Yubico YubiKey 5 NFC devices 5.0.0 to 5.2.6 and 5.3.0 to 5.3.1. The OTP application allows a user to set optional access codes on OTP slots. This access code is intended to prevent unauthorized changes to OTP configurations. The access code is not checked when updating NFC specific components of the OTP configurations. This may allow an attacker to access configured OTPs and passwords stored in slots that were not configured by the user to be read over NFC, despite a user having set an access code. (Users who have not set an access code, or who have not configured the OTP slots, are not impacted by this issue.)

Frequently asked questions

What is CVE-2020-15001?: An information leak was discovered on Yubico YubiKey 5 NFC devices 5.0.0 to 5.2.6 and 5.3.0 to 5.3.1. The OTP application allows a user to set optional access codes on OTP slots. This access code is intended to prevent unauthorized changes to OTP configurations. The access code is not checked when updating NFC specific components of the OTP configurations. This may allow an attacker to access configured OTPs and passwords stored in slots that were not configured by the user to be read over NFC, despite a user having set an access code. (Users who have not set an access code, or who have not configured the OTP slots, are not impacted by this issue.)
How severe is CVE-2020-15001?: CVE-2020-15001 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-15001 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15001?: CVE-2020-15001 affects Yubico Yubikey 5 Nfc Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15001?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-15001 published?: CVE-2020-15001 was published on 2020-07-09 and last updated on 2026-06-17.

References

https://www.yubico.com/support/security-advisories/ysa-2020-04/

Affected products (1)

cpe:2.3:o:yubico:yubikey_5_nfc_firmware:*:*:*:*:*:*:*:*

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