How severe is CVE-2025-13826?

CVE-2025-13826 has a CVSS 4.0 base score of 8.2, rated high severity.

Is CVE-2025-13826 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-13826?

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.

Does CVE-2025-13826 have an EU (EUVD) identifier?

Yes. CVE-2025-13826 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209536.

When was CVE-2025-13826 published?

CVE-2025-13826 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2025-13826

CVE-2025-13826 is a high-severity vulnerability with a CVSS 4.0 base score of 8.2. 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 4.0 base score 8.2)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-209536
Weakness: CWE-20
Published: 2026-04-21
Last modified: 2026-06-17

Description

Zervit's portable HTTP/web server is vulnerable to remote DoS attacks when a configuration reset request is made. The vulnerability is caused by inadequate validation of user-supplied input. An attacker can exploit this vulnerability by sending malicious requests. If the vulnerability is successfully exploited, the application can be made to stop responding, resulting in a DoS condition. It is possible to manually restart the application.

Frequently asked questions

What is CVE-2025-13826?: Zervit's portable HTTP/web server is vulnerable to remote DoS attacks when a configuration reset request is made. The vulnerability is caused by inadequate validation of user-supplied input. An attacker can exploit this vulnerability by sending malicious requests. If the vulnerability is successfully exploited, the application can be made to stop responding, resulting in a DoS condition. It is possible to manually restart the application.
How severe is CVE-2025-13826?: CVE-2025-13826 has a CVSS 4.0 base score of 8.2, rated high severity.
Is CVE-2025-13826 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-13826?: 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.
Does CVE-2025-13826 have an EU (EUVD) identifier?: Yes. CVE-2025-13826 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209536.
When was CVE-2025-13826 published?: CVE-2025-13826 was published on 2026-04-21 and last updated on 2026-06-17.

References

https://www.incibe.es/en/incibe-cert/notices/aviso/incorrect-input-validation-zervit-portable-httpweb-server

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