How severe is CVE-2020-15000?

CVE-2020-15000 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-15000 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15000?

CVE-2020-15000 affects Yubico Yubikey 5 Nfc Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15000?

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

When was CVE-2020-15000 published?

CVE-2020-15000 was published on 2020-07-09 and last updated on 2026-06-17.

CVE-2020-15000

CVE-2020-15000 is a medium-severity vulnerability in Yubico Yubikey 5 Nfc Firmware with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Yubico Yubikey 5 Nfc Firmware
Published: 2020-07-09
Last modified: 2026-06-17

Description

A PIN management problem was discovered on Yubico YubiKey 5 devices 5.2.0 to 5.2.6. OpenPGP has three passwords: Admin PIN, Reset Code, and User PIN. The Reset Code is used to reset the User PIN, but it is disabled by default. A flaw in the implementation of OpenPGP sets the Reset Code to a known value upon initialization. If the retry counter for the Reset Code is set to non-zero without changing the Reset Code, this known value can be used to reset the User PIN. To set the retry counters, the Admin PIN is required.

Frequently asked questions

What is CVE-2020-15000?: A PIN management problem was discovered on Yubico YubiKey 5 devices 5.2.0 to 5.2.6. OpenPGP has three passwords: Admin PIN, Reset Code, and User PIN. The Reset Code is used to reset the User PIN, but it is disabled by default. A flaw in the implementation of OpenPGP sets the Reset Code to a known value upon initialization. If the retry counter for the Reset Code is set to non-zero without changing the Reset Code, this known value can be used to reset the User PIN. To set the retry counters, the Admin PIN is required.
How severe is CVE-2020-15000?: CVE-2020-15000 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-15000 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15000?: CVE-2020-15000 affects Yubico Yubikey 5 Nfc Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15000?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-15000 published?: CVE-2020-15000 was published on 2020-07-09 and last updated on 2026-06-17.

References

https://www.yubico.com/support/security-advisories/ysa-2020-05/

Affected products (1)

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

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