How severe is CVE-2025-54336?

CVE-2025-54336 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-2025-54336 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-54336?

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.

Does CVE-2025-54336 have an EU (EUVD) identifier?

Yes. CVE-2025-54336 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25168.

When was CVE-2025-54336 published?

CVE-2025-54336 was published on 2025-08-19 and last updated on 2026-06-17.

CVE-2025-54336

CVE-2025-54336 is a critical-severity vulnerability 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-697.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25168
Weakness: CWE-697
Published: 2025-08-19
Last modified: 2026-06-17

Description

In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison. Thus, if the correct password is "0e" followed by any digit string, then an attacker can login with any other string that evaluates to 0.0 (such as the 0e0 string). This occurs in admin/plib/LoginManager.php.

Frequently asked questions

What is CVE-2025-54336?: In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison. Thus, if the correct password is "0e" followed by any digit string, then an attacker can login with any other string that evaluates to 0.0 (such as the 0e0 string). This occurs in admin/plib/LoginManager.php.
How severe is CVE-2025-54336?: CVE-2025-54336 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-2025-54336 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-54336?: 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.
Does CVE-2025-54336 have an EU (EUVD) identifier?: Yes. CVE-2025-54336 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25168.
When was CVE-2025-54336 published?: CVE-2025-54336 was published on 2025-08-19 and last updated on 2026-06-17.

References

Other CWE-697 vulnerabilities

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CVE-2023-32571 — Critical (CVSS 9.8): Dynamic Linq 1.0.7.10 through 1.2.25 before 1.3.0 allows attackers to execute arbitrary code and commands when…
CVE-2022-47034 — Critical (CVSS 9.8): A type juggling vulnerability in the component /auth/fn.php of PlaySMS v1.4.5 and earlier allows attackers to bypass…
CVE-2021-44971 — Critical (CVSS 9.8): Multiple Tenda devices are affected by authentication bypass, such as AC15V1.0 Firmware V15.03.05.20_multi?AC5V1.0…
CVE-2021-3833 — Critical (CVSS 9.8): Integria IMS login check uses a loose comparator ("==") to compare the MD5 hash of the password provided by the user…

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