How severe is CVE-2020-7666?

CVE-2020-7666 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-7666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7666?

CVE-2020-7666 affects U-root. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7666?

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-2020-7666 published?

CVE-2020-7666 was published on 2020-09-01 and last updated on 2026-06-17.

CVE-2020-7666

CVE-2020-7666 is a high-severity vulnerability in U-root with a CVSS 3.x base score of 7.5. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: U-root
Published: 2020-09-01
Last modified: 2026-06-17

Description

This affects all versions of package github.com/u-root/u-root/pkg/cpio. It is vulnerable to leading, non-leading relative path traversal attacks and symlink based (relative and absolute) path traversal attacks in cpio file extraction.

Frequently asked questions

What is CVE-2020-7666?: This affects all versions of package github.com/u-root/u-root/pkg/cpio. It is vulnerable to leading, non-leading relative path traversal attacks and symlink based (relative and absolute) path traversal attacks in cpio file extraction.
How severe is CVE-2020-7666?: CVE-2020-7666 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-7666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7666?: CVE-2020-7666 affects U-root. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7666?: 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-2020-7666 published?: CVE-2020-7666 was published on 2020-09-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:u-root:u-root:*:*:*:*:*:*:*:*

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