Home/CVE/libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an I
CVE

CVE-2025-4947

libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an I

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.

MEDIUM · CVSS 6.5 EPSS 0.00075
Schedule remediation
  • Public exploit or PoC is available
Sigma rules7 YARA rules0
⬡

Weakness Classification

CWE-295Improper Certificate Validation
▤

Affected Products & Versions

1
haxx curl>= 8.8.0 and < 8.14.0
⚠

Public Exploits & PoCs

1
pochackerone.com · 3150884hackerone.com
◈

Sigma Hunt Rules

7
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious Download and Execute Pattern via Curl/Wget
producthighSuspicious File Download From File Sharing Domain Via Curl.EXE
producthighSuspicious File Download From IP Via Curl.EXE
producthighCurl Download And Execute Combination
producthighSuspicious Curl.EXE Download
productmediumSuspicious Curl File Upload - Linux
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · 2499f714-1537-4658-8207-48ae4bb9eae9
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 May 2025 · 07:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

4
suse-csafSUSE-SU-2025:03198-1
suse-csafSUSE-SU-2025:20675-1
msrcCVE-2025-4947
suse-csafopenSUSE-SU-2025:15176-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://curl.se/docs/CVE-2025-4947.htmlPatchVendor Advisory
https://curl.se/docs/CVE-2025-4947.jsonVendor Advisory
http://www.openwall.com/lists/oss-security/2025/05/28/4Mailing ListPatchThird Party Advisory
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