How severe is CVE-2023-33404?

CVE-2023-33404 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-2023-33404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-33404?

CVE-2023-33404 affects Blogengine Blogengine.net. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-33404?

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-2023-33404 published?

CVE-2023-33404 was published on 2023-06-26 and last updated on 2026-06-17.

CVE-2023-33404

CVE-2023-33404 is a critical-severity vulnerability in Blogengine Blogengine.net with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Blogengine Blogengine.net
Published: 2023-06-26
Last modified: 2026-06-17

Description

An Unrestricted Upload vulnerability, due to insufficient validation on UploadControlled.cs file, in BlogEngine.Net version 3.3.8.0 and earlier allows remote attackers to execute remote code.

Frequently asked questions

What is CVE-2023-33404?: An Unrestricted Upload vulnerability, due to insufficient validation on UploadControlled.cs file, in BlogEngine.Net version 3.3.8.0 and earlier allows remote attackers to execute remote code.
How severe is CVE-2023-33404?: CVE-2023-33404 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-2023-33404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-33404?: CVE-2023-33404 affects Blogengine Blogengine.net. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-33404?: 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-2023-33404 published?: CVE-2023-33404 was published on 2023-06-26 and last updated on 2026-06-17.

References

https://github.com/hacip/CVE-2023-33404

Affected products (1)

cpe:2.3:a:blogengine:blogengine.net:*:*:*:*:*:*:*:*

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