How severe is CVE-2021-27375?

CVE-2021-27375 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-27375 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27375?

CVE-2021-27375 affects Containous Traefik. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27375?

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

When was CVE-2021-27375 published?

CVE-2021-27375 was published on 2021-02-18 and last updated on 2026-06-17.

CVE-2021-27375

CVE-2021-27375 is a medium-severity vulnerability in Containous Traefik with a CVSS 3.x base score of 5.3. 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-1021.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1021
Affected product: Containous Traefik
Published: 2021-02-18
Last modified: 2026-06-17

Description

Traefik before 2.4.5 allows the loading of IFRAME elements from other domains.

Frequently asked questions

What is CVE-2021-27375?: Traefik before 2.4.5 allows the loading of IFRAME elements from other domains.
How severe is CVE-2021-27375?: CVE-2021-27375 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-27375 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27375?: CVE-2021-27375 affects Containous Traefik. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27375?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27375 published?: CVE-2021-27375 was published on 2021-02-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:containous:traefik:*:*:*:*:*:*:*:*

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