How severe is CVE-2018-9275?

CVE-2018-9275 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2018-9275 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9275?

CVE-2018-9275 affects Yubico Yubico Pam. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9275?

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-2018-9275 published?

CVE-2018-9275 was published on 2018-04-04 and last updated on 2026-06-17.

CVE-2018-9275

CVE-2018-9275 is a high-severity vulnerability in Yubico Yubico Pam with a CVSS 3.x base score of 8.2. 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-200.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 6.4
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Yubico Yubico Pam
Published: 2018-04-04
Last modified: 2026-06-17

Description

In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).

Frequently asked questions

What is CVE-2018-9275?: In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
How severe is CVE-2018-9275?: CVE-2018-9275 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2018-9275 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9275?: CVE-2018-9275 affects Yubico Yubico Pam. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9275?: 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-2018-9275 published?: CVE-2018-9275 was published on 2018-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yubico:yubico_pam:*:*:*:*:*:yubico:*:*

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