How severe is CVE-2021-30175?

CVE-2021-30175 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-2021-30175 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30175?

CVE-2021-30175 affects Zerof Web Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30175?

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-2021-30175 published?

CVE-2021-30175 was published on 2021-04-13 and last updated on 2026-06-17.

CVE-2021-30175

CVE-2021-30175 is a critical-severity vulnerability in Zerof Web Server 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 9% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Zerof Web Server
Published: 2021-04-13
Last modified: 2026-06-17

Description

ZEROF Web Server 1.0 (April 2021) allows SQL Injection via the /HandleEvent endpoint for the login page.

Frequently asked questions

What is CVE-2021-30175?: ZEROF Web Server 1.0 (April 2021) allows SQL Injection via the /HandleEvent endpoint for the login page.
How severe is CVE-2021-30175?: CVE-2021-30175 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-2021-30175 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30175?: CVE-2021-30175 affects Zerof Web Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30175?: 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-2021-30175 published?: CVE-2021-30175 was published on 2021-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:zerof:web_server:1.0:*:*:*:*:*:*:*

More vulnerabilities in Zerof Web Server

CVE-2022-25322 — Critical (CVSS 9.8): ZEROF Web Server 2.0 allows /HandleEvent SQL Injection.
CVE-2022-25323 — Medium (CVSS 6.1): ZEROF Web Server 2.0 allows /admin.back XSS.

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