How severe is CVE-2025-6421?

CVE-2025-6421 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-6421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-6421?

CVE-2025-6421 affects Fabian Simple Online Hotel Reservation System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-6421?

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-2025-6421 have an EU (EUVD) identifier?

Yes. CVE-2025-6421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18876.

When was CVE-2025-6421 published?

CVE-2025-6421 was published on 2025-06-21 and last updated on 2026-06-17.

CVE-2025-6421

CVE-2025-6421 is a high-severity vulnerability in Fabian Simple Online Hotel Reservation System with a CVSS 3.x base score of 7.3. 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-74.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v2: 7.5
CVSS v4: 5.5
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18876
Weakness: CWE-74
Affected product: Fabian Simple Online Hotel Reservation System
Published: 2025-06-21
Last modified: 2026-06-17

Description

A vulnerability was found in code-projects Simple Online Hotel Reservation System 1.0. It has been rated as critical. This issue affects some unknown processing of the file /admin/add_account.php. The manipulation of the argument name/admin_id leads to sql injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2025-6421?: A vulnerability was found in code-projects Simple Online Hotel Reservation System 1.0. It has been rated as critical. This issue affects some unknown processing of the file /admin/add_account.php. The manipulation of the argument name/admin_id leads to sql injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2025-6421?: CVE-2025-6421 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-6421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-6421?: CVE-2025-6421 affects Fabian Simple Online Hotel Reservation System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-6421?: 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-2025-6421 have an EU (EUVD) identifier?: Yes. CVE-2025-6421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18876.
When was CVE-2025-6421 published?: CVE-2025-6421 was published on 2025-06-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fabian:simple_online_hotel_reservation_system:1.0:*:*:*:*:*:*:*

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