How severe is CVE-2021-23430?

CVE-2021-23430 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-23430 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23430?

CVE-2021-23430 affects Startserver Project Startserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23430?

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-2021-23430 published?

CVE-2021-23430 was published on 2021-08-24 and last updated on 2026-06-17.

CVE-2021-23430

CVE-2021-23430 is a high-severity vulnerability in Startserver Project Startserver with a CVSS 3.x base score of 7.5. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Startserver Project Startserver
Published: 2021-08-24
Last modified: 2026-06-17

Description

All versions of package startserver are vulnerable to Directory Traversal due to missing sanitization.

Frequently asked questions

What is CVE-2021-23430?: All versions of package startserver are vulnerable to Directory Traversal due to missing sanitization.
How severe is CVE-2021-23430?: CVE-2021-23430 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-23430 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23430?: CVE-2021-23430 affects Startserver Project Startserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23430?: 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-2021-23430 published?: CVE-2021-23430 was published on 2021-08-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:startserver_project:startserver:*:*:*:*:*:node.js:*:*

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