How severe is CVE-2020-36657?

CVE-2020-36657 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-36657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36657?

CVE-2020-36657 affects Uptimed Project Uptimed. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36657?

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-2020-36657 published?

CVE-2020-36657 was published on 2023-01-26 and last updated on 2026-06-17.

CVE-2020-36657

CVE-2020-36657 is a high-severity vulnerability in Uptimed Project Uptimed with a CVSS 3.x base score of 7.8. 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-59.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-59
Affected product: Uptimed Project Uptimed
Published: 2023-01-26
Last modified: 2026-06-17

Description

uptimed before 0.4.6-r1 on Gentoo allows local users (with access to the uptimed user account) to gain root privileges by creating a hard link within the /var/spool/uptimed directory, because there is an unsafe chown -R call.

Frequently asked questions

What is CVE-2020-36657?: uptimed before 0.4.6-r1 on Gentoo allows local users (with access to the uptimed user account) to gain root privileges by creating a hard link within the /var/spool/uptimed directory, because there is an unsafe chown -R call.
How severe is CVE-2020-36657?: CVE-2020-36657 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-36657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36657?: CVE-2020-36657 affects Uptimed Project Uptimed. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36657?: 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-2020-36657 published?: CVE-2020-36657 was published on 2023-01-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:uptimed_project:uptimed:*:*:*:*:*:gentoo:*:*

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