How severe is CVE-2025-64764?

CVE-2025-64764 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2025-64764 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-64764?

CVE-2025-64764 affects Astro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-64764?

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-2025-64764 have an EU (EUVD) identifier?

Yes. CVE-2025-64764 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198184.

When was CVE-2025-64764 published?

CVE-2025-64764 was published on 2025-11-19 and last updated on 2026-06-17.

CVE-2025-64764

CVE-2025-64764 is a high-severity vulnerability in Astro with a CVSS 3.x base score of 7.1. 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-80.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198184
Weakness: CWE-80
Affected product: Astro
Published: 2025-11-19
Last modified: 2026-06-17

Description

Astro is a web framework. Prior to version 5.15.8, a reflected XSS vulnerability is present when the server islands feature is used in the targeted application, regardless of what was intended by the component template(s). This issue has been patched in version 5.15.8.

Frequently asked questions

What is CVE-2025-64764?: Astro is a web framework. Prior to version 5.15.8, a reflected XSS vulnerability is present when the server islands feature is used in the targeted application, regardless of what was intended by the component template(s). This issue has been patched in version 5.15.8.
How severe is CVE-2025-64764?: CVE-2025-64764 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2025-64764 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-64764?: CVE-2025-64764 affects Astro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-64764?: 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-2025-64764 have an EU (EUVD) identifier?: Yes. CVE-2025-64764 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198184.
When was CVE-2025-64764 published?: CVE-2025-64764 was published on 2025-11-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*

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