Certificate Verification Vulnerability in libcurl Affecting QUIC Connections
CVE-2025-4947

6.5MEDIUM

Key Information:

Vendor

Curl

Status
Curl
Vendor
CVE Published:
28 May 2025

What is CVE-2025-4947?

A vulnerability in libcurl allows for certificate verification to be skipped when QUIC connections are made to a host specified as an IP address. This oversight can lead to potential man-in-the-middle attacks, as the system fails to authenticate the identity of the server, making it susceptible to impersonation and data interception.

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Affected Version(s)

curl 8.13.0

curl 8.12.1

curl 8.12.0

References

https://curl.se/docs/CVE-2025-4947.json
https://curl.se/docs/CVE-2025-4947.html
https://hackerone.com/reports/3150884

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Hiroki Kurosawa
Stefan Eissing
JSON
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