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CVE-2025-5399

Haxx Curl denial of service

7.5 HIGHPublic exploitEPSS 1.38%
  1. Published7 Jun 2025

Description

Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop. There is no other way for the application to escape or exit this loop other than killing the thread/process. This might be used to DoS libcurl-using application.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Haxx Curl≥ 8.13.0 < 8.14.1

Remediation

Fixed in
Haxx Curl≥ 8.14.1

References

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Frequently asked

Is CVE-2025-5399 being actively exploited?

CVE-2025-5399 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.38%.

How severe is CVE-2025-5399?

CVE-2025-5399 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 1.38% probability of exploitation.

Which products are affected by CVE-2025-5399?

Affected products include Haxx Curl.

How do I fix CVE-2025-5399?

Upgrade affected software to a fixed version, for example Haxx Curl 8.14.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-5399 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.