How severe is CVE-2025-64767?

CVE-2025-64767 has a CVSS 3.x base score of 9.1, 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 none.

Is CVE-2025-64767 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-64767?

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-2025-64767 have an EU (EUVD) identifier?

Yes. CVE-2025-64767 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198319.

When was CVE-2025-64767 published?

CVE-2025-64767 was published on 2025-11-21 and last updated on 2026-06-17.

CVE-2025-64767

CVE-2025-64767 is a critical-severity vulnerability with a CVSS 3.x base score of 9.1. 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-323.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198319
Weakness: CWE-323
Published: 2025-11-21
Last modified: 2026-06-17

Description

hpke-js is a Hybrid Public Key Encryption (HPKE) module built on top of Web Cryptography API. Prior to version 1.7.5, the public SenderContext Seal() API has a race condition which allows for the same AEAD nonce to be re-used for multiple Seal() calls. This can lead to complete loss of Confidentiality and Integrity of the produced messages. This issue has been patched in version 1.7.5.

Frequently asked questions

What is CVE-2025-64767?: hpke-js is a Hybrid Public Key Encryption (HPKE) module built on top of Web Cryptography API. Prior to version 1.7.5, the public SenderContext Seal() API has a race condition which allows for the same AEAD nonce to be re-used for multiple Seal() calls. This can lead to complete loss of Confidentiality and Integrity of the produced messages. This issue has been patched in version 1.7.5.
How severe is CVE-2025-64767?: CVE-2025-64767 has a CVSS 3.x base score of 9.1, 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 none.
Is CVE-2025-64767 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-64767?: 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-2025-64767 have an EU (EUVD) identifier?: Yes. CVE-2025-64767 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198319.
When was CVE-2025-64767 published?: CVE-2025-64767 was published on 2025-11-21 and last updated on 2026-06-17.

References

Other CWE-323 vulnerabilities

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CVE-2026-49952 — Critical (CVSS 9.1): Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows…
CVE-2025-47345 — High (CVSS 8.4): Cryptographic issue may occur while encrypting license data.
CVE-2026-3559 — High (CVSS 8.1): Philips Hue Bridge HomeKit Accessory Protocol Static Nonce Authentication Bypass Vulnerability. This vulnerability…
CVE-2026-55967 — High (CVSS 7.5): AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected…

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