How severe is CVE-2020-27831?

CVE-2020-27831 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2020-27831 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27831?

CVE-2020-27831 affects Redhat Quay. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27831?

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

When was CVE-2020-27831 published?

CVE-2020-27831 was published on 2021-05-27 and last updated on 2026-06-17.

CVE-2020-27831

CVE-2020-27831 is a medium-severity vulnerability in Redhat Quay with a CVSS 3.x base score of 4.3. 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-522.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Redhat Quay
Published: 2021-05-27
Last modified: 2026-06-17

Description

A flaw was found in Red Hat Quay, where it does not properly protect the authorization token when authorizing email addresses for repository email notifications. This flaw allows an attacker to add email addresses they do not own to repository notifications.

Frequently asked questions

What is CVE-2020-27831?: A flaw was found in Red Hat Quay, where it does not properly protect the authorization token when authorizing email addresses for repository email notifications. This flaw allows an attacker to add email addresses they do not own to repository notifications.
How severe is CVE-2020-27831?: CVE-2020-27831 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2020-27831 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27831?: CVE-2020-27831 affects Redhat Quay. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27831?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-27831 published?: CVE-2020-27831 was published on 2021-05-27 and last updated on 2026-06-17.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1905758

Affected products (1)

cpe:2.3:a:redhat:quay:*:*:*:*:*:*:*:*

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