How severe is CVE-2025-52473?

CVE-2025-52473 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-52473 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-52473?

CVE-2025-52473 affects Openquantumsafe Liboqs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-52473?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-52473 have an EU (EUVD) identifier?

Yes. CVE-2025-52473 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21027.

When was CVE-2025-52473 published?

CVE-2025-52473 was published on 2025-07-10 and last updated on 2026-06-17.

CVE-2025-52473

CVE-2025-52473 is a medium-severity vulnerability in Openquantumsafe Liboqs with a CVSS 3.x base score of 5.9. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-21027
Weakness: CWE-200
Affected product: Openquantumsafe Liboqs
Published: 2025-07-10
Last modified: 2026-06-17

Description

liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Multiple secret-dependent branches have been identified in the reference implementation of the HQC key encapsulation mechanism when it is compiled with Clang for optimization levels above -O0 (-O1, -O2, etc). A proof-of-concept local attack exploits this secret-dependent information to recover the entire secret key. This vulnerability is fixed in 0.14.0.

Frequently asked questions

What is CVE-2025-52473?: liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Multiple secret-dependent branches have been identified in the reference implementation of the HQC key encapsulation mechanism when it is compiled with Clang for optimization levels above -O0 (-O1, -O2, etc). A proof-of-concept local attack exploits this secret-dependent information to recover the entire secret key. This vulnerability is fixed in 0.14.0.
How severe is CVE-2025-52473?: CVE-2025-52473 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-52473 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-52473?: CVE-2025-52473 affects Openquantumsafe Liboqs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-52473?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-52473 have an EU (EUVD) identifier?: Yes. CVE-2025-52473 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21027.
When was CVE-2025-52473 published?: CVE-2025-52473 was published on 2025-07-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:*

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