How severe is CVE-2021-33708?

CVE-2021-33708 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33708 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33708?

CVE-2021-33708 affects Kyma-project Kyma. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33708?

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-2021-33708 published?

CVE-2021-33708 was published on 2021-08-10 and last updated on 2026-06-17.

CVE-2021-33708

CVE-2021-33708 is a high-severity vulnerability in Kyma-project Kyma with a CVSS 3.x base score of 8.8. 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-20.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Kyma-project Kyma
Published: 2021-08-10
Last modified: 2026-06-17

Description

Due to insufficient input validation in Kyma, authenticated users can pass a Header of their choice and escalate privileges.

Frequently asked questions

What is CVE-2021-33708?: Due to insufficient input validation in Kyma, authenticated users can pass a Header of their choice and escalate privileges.
How severe is CVE-2021-33708?: CVE-2021-33708 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33708 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33708?: CVE-2021-33708 affects Kyma-project Kyma. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33708?: 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-2021-33708 published?: CVE-2021-33708 was published on 2021-08-10 and last updated on 2026-06-17.

References

https://github.com/kyma-project/kyma/security/advisories/GHSA-f2jp-5gj4-q9c9

Affected products (1)

cpe:2.3:a:kyma-project:kyma:*:*:*:*:*:*:*:*

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