How severe is CVE-2025-51606?

CVE-2025-51606 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-51606 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-51606?

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-2025-51606 have an EU (EUVD) identifier?

Yes. CVE-2025-51606 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25521.

When was CVE-2025-51606 published?

CVE-2025-51606 was published on 2025-08-21 and last updated on 2026-06-17.

CVE-2025-51606

CVE-2025-51606 is a high-severity vulnerability with a CVSS 3.x base score of 8.8. 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-798.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25521
Weakness: CWE-798
Published: 2025-08-21
Last modified: 2026-06-17

Description

hippo4j 1.0.0 to 1.5.0, uses a hard-coded secret key in its JWT (JSON Web Token) creation. This allows attackers with access to the source code or compiled binary to forge valid access tokens and impersonate any user, including privileged ones such as "admin". The vulnerability poses a critical security risk in systems where authentication and authorization rely on the integrity of JWTs.

Frequently asked questions

What is CVE-2025-51606?: hippo4j 1.0.0 to 1.5.0, uses a hard-coded secret key in its JWT (JSON Web Token) creation. This allows attackers with access to the source code or compiled binary to forge valid access tokens and impersonate any user, including privileged ones such as "admin". The vulnerability poses a critical security risk in systems where authentication and authorization rely on the integrity of JWTs.
How severe is CVE-2025-51606?: CVE-2025-51606 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-51606 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-51606?: 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-2025-51606 have an EU (EUVD) identifier?: Yes. CVE-2025-51606 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25521.
When was CVE-2025-51606 published?: CVE-2025-51606 was published on 2025-08-21 and last updated on 2026-06-17.

References

https://github.com/ShenxiuSec/cve-proofs/blob/main/POC-20250610-01.md

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