How severe is CVE-2019-12210?

CVE-2019-12210 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2019-12210 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12210?

CVE-2019-12210 affects Yubico Pam-u2f. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12210?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-12210 published?

CVE-2019-12210 was published on 2019-06-04 and last updated on 2026-06-17.

CVE-2019-12210

CVE-2019-12210 is a high-severity vulnerability in Yubico Pam-u2f with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 5.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Yubico Pam-u2f
Published: 2019-06-04
Last modified: 2026-06-17

Description

In Yubico pam-u2f 1.0.7, when configured with debug and a custom debug log file is set using debug_file, that file descriptor is not closed when a new process is spawned. This leads to the file descriptor being inherited into the child process; the child process can then read from and write to it. This can leak sensitive information and also, if written to, be used to fill the disk or plant misinformation.

Frequently asked questions

What is CVE-2019-12210?: In Yubico pam-u2f 1.0.7, when configured with debug and a custom debug log file is set using debug_file, that file descriptor is not closed when a new process is spawned. This leads to the file descriptor being inherited into the child process; the child process can then read from and write to it. This can leak sensitive information and also, if written to, be used to fill the disk or plant misinformation.
How severe is CVE-2019-12210?: CVE-2019-12210 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2019-12210 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12210?: CVE-2019-12210 affects Yubico Pam-u2f. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12210?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-12210 published?: CVE-2019-12210 was published on 2019-06-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yubico:pam-u2f:1.0.7:*:*:*:*:*:*:*

More vulnerabilities in Yubico Pam-u2f

CVE-2019-12209 — High (CVSS 7.5): Yubico pam-u2f 1.0.7 attempts parsing of the configured authfile (default $HOME/.config/Yubico/u2f_keys) as root…
CVE-2021-31924 — Medium (CVSS 6.8): Yubico pam-u2f before 1.1.1 has a logic issue that, depending on the pam-u2f configuration and the application used,…

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