Medium severity · published May 28, 2025
CVE-2025-4947
QUIC certificate check skip with wolfSSL
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an IP address in the URL. Therefore, it does not detect impostors or man-in-the-middle attacks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
8.13.0 through 8.13.0; 8.12.1 through 8.12.1; 8.12.0 through 8.12.0; 8.11.1 through 8.11.1; 8.11.0 through 8.11.0; 8.10.1 through 8.10.1; +4 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-4947
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-4947
Patch
https://curl.se/docs/CVE-2025-4947.html
Vendor Advisory
https://curl.se/docs/CVE-2025-4947.json
Exploit
https://hackerone.com/reports/3150884
Mailing List
http://www.openwall.com/lists/oss-security/2025/05/28/4
More from curl
9.8
CVE-2026-19931
Negotiate ambient user conn reuse
9.8
CVE-2026-9079
stale proxy password leak
9.8
CVE-2026-8925
SASL double-free
9.8
CVE-2026-11856
cross-origin Digest auth state leak
9.8
CVE-2026-10536
HTTP/2 stream-dependency tree UAF