Improper Certificate Validation Affecting curl package, versions [8.8.0,8.14.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CURL-10259947
- published29 May 2025
- disclosed28 May 2025
- creditHiroki Kurosawa
Introduced: 28 May 2025
NewCVE-2025-4947 (opens in a new tab)How to fix?
Upgrade curl to version 8.14.0 or higher.
Overview
curl is a command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP. libcurl offers a myriad of powerful features.
Affected versions of this package are vulnerable to Improper Certificate Validation when wolfSSL is used as the TLS backend for QUIC. An attacker can impersonate a legitimate server or perform a man-in-the-middle attack by exploiting a skipped certificate verification.
Note: The skip of the certificate verification for QUIC connections only occurs when connecting to a host specified as an IP address in the URL
PoC
1) Prepare curl with WolfSSL backend.
2) To resolve the domain name google.com and obtain its IP address for testing purposes(142.251.222.14).
3) curl --http3 https://142.251.222.14