How severe is CVE-2025-5025?

CVE-2025-5025 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-5025 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-5025?

CVE-2025-5025 affects Haxx Curl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-5025?

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

Does CVE-2025-5025 have an EU (EUVD) identifier?

Yes. CVE-2025-5025 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16332.

When was CVE-2025-5025 published?

CVE-2025-5025 was published on 2025-05-28 and last updated on 2026-06-17.

CVE-2025-5025

CVE-2025-5025 is a medium-severity vulnerability in Haxx Curl with a CVSS 3.x base score of 4.8. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16332
Weakness: CWE-295
Affected product: Haxx Curl
Published: 2025-05-28
Last modified: 2026-06-17

Description

libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing.

Frequently asked questions

What is CVE-2025-5025?: libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing.
How severe is CVE-2025-5025?: CVE-2025-5025 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-5025 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-5025?: CVE-2025-5025 affects Haxx Curl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-5025?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-5025 have an EU (EUVD) identifier?: Yes. CVE-2025-5025 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16332.
When was CVE-2025-5025 published?: CVE-2025-5025 was published on 2025-05-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

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