How severe is CVE-2025-66479?

CVE-2025-66479 has a CVSS 4.0 base score of 1.8, rated low severity.

Is CVE-2025-66479 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66479?

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

Does CVE-2025-66479 have an EU (EUVD) identifier?

Yes. CVE-2025-66479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201249.

When was CVE-2025-66479 published?

CVE-2025-66479 was published on 2025-12-04 and last updated on 2026-06-17.

CVE-2025-66479

CVE-2025-66479 is a low-severity vulnerability with a CVSS 4.0 base score of 1.8. 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-693.

Key facts

Severity: Low (CVSS 4.0 base score 1.8)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201249
Weakness: CWE-693
Published: 2025-12-04
Last modified: 2026-06-17

Description

Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.

Frequently asked questions

What is CVE-2025-66479?: Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.
How severe is CVE-2025-66479?: CVE-2025-66479 has a CVSS 4.0 base score of 1.8, rated low severity.
Is CVE-2025-66479 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-66479?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66479 have an EU (EUVD) identifier?: Yes. CVE-2025-66479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201249.
When was CVE-2025-66479 published?: CVE-2025-66479 was published on 2025-12-04 and last updated on 2026-06-17.

References

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