How severe is CVE-2021-34066?

CVE-2021-34066 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-34066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34066?

CVE-2021-34066 affects Edgegallery Developer-be. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34066?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-34066 published?

CVE-2021-34066 was published on 2021-08-30 and last updated on 2026-06-17.

CVE-2021-34066

CVE-2021-34066 is a critical-severity vulnerability in Edgegallery Developer-be with a CVSS 3.x base score of 9.8. 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Edgegallery Developer-be
Published: 2021-08-30
Last modified: 2026-06-17

Description

An issue was discovered in EdgeGallery/developer before v1.0. There is a "Deserialization of yaml file" vulnerability that can allow attackers to execute system command through uploading the malicious constructed YAML file.

Frequently asked questions

What is CVE-2021-34066?: An issue was discovered in EdgeGallery/developer before v1.0. There is a "Deserialization of yaml file" vulnerability that can allow attackers to execute system command through uploading the malicious constructed YAML file.
How severe is CVE-2021-34066?: CVE-2021-34066 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-34066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34066?: CVE-2021-34066 affects Edgegallery Developer-be. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34066?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-34066 published?: CVE-2021-34066 was published on 2021-08-30 and last updated on 2026-06-17.

References

https://github.com/EdgeGallery/developer-be/issues/1

Affected products (1)

cpe:2.3:a:edgegallery:developer-be:*:*:*:*:*:*:*:*

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