How severe is CVE-2025-1867?

CVE-2025-1867 has a CVSS 4.0 base score of 10.0, rated critical severity.

Is CVE-2025-1867 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-1867?

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-2025-1867 have an EU (EUVD) identifier?

Yes. CVE-2025-1867 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5808.

When was CVE-2025-1867 published?

CVE-2025-1867 was published on 2025-03-03 and last updated on 2026-06-17.

CVE-2025-1867

CVE-2025-1867 is a critical-severity vulnerability with a CVSS 4.0 base score of 10.0. 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-444.

Key facts

Severity: Critical (CVSS 4.0 base score 10.0)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-5808
Weakness: CWE-444
Published: 2025-03-03
Last modified: 2026-06-17

Description

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in ithewei libhv allows HTTP Response Smuggling.This issue affects libhv: through 1.3.3.

Frequently asked questions

What is CVE-2025-1867?: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in ithewei libhv allows HTTP Response Smuggling.This issue affects libhv: through 1.3.3.
How severe is CVE-2025-1867?: CVE-2025-1867 has a CVSS 4.0 base score of 10.0, rated critical severity.
Is CVE-2025-1867 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-1867?: 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-2025-1867 have an EU (EUVD) identifier?: Yes. CVE-2025-1867 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5808.
When was CVE-2025-1867 published?: CVE-2025-1867 was published on 2025-03-03 and last updated on 2026-06-17.

References

https://github.com/ithewei/libhv/pull/689

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