CVE-2025-4947 | QUIC certificate check skip with wolfSSL

Exp

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.

Published: 2025-05-28 Last update: 2025-06-26 Assigner: 2499f714-1537-4658-8207-48ae4bb9eae9 Source: 2499f714-1537-4658-8207-48ae4bb9eae9
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-4947 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2025-4947

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2025-4947

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-24 0.01% 0.07% +0.07%
2 2025-05-28 — 0.01% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-4947

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-4947

OS Trackers for CVE-2025-4947

vendor priority summary link
alpine — CVE-2025-4947: 1 source package rows (curl); 256 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 256, open 0. https://security.alpinelinux.org/vuln/CVE-2025-4947
debian unimportant CVE-2025-4947 unimportant priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-4947
redhat medium — https://access.redhat.com/security/cve/CVE-2025-4947
suse medium CVE-2025-4947 severity moderate: SUSE including 290 source package names (0.0.17-1.1:curl-8.14.1-150600.4.28.1, 0.0.17-1.1:libcurl4-8.14.1-150600.4.28.1, …), 552 product×package rows across 145 product lines (Container bci/spack, Container containers/lmcache-lmstack-router, … (145 product lines)): Fixed 239, Known Affected 231, Known Not Affected 82. https://www.suse.com/security/cve/CVE-2025-4947/
ubuntu medium CVE-2025-4947 medium priority: Ubuntu including 1 source packages (curl), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, trusty, upstream, xenial): not-affected 8, released 1. https://ubuntu.com/security/CVE-2025-4947

Affected software / configurations for CVE-2025-4947

Vendor Product Version Raw CPE
haxx curl >= 8.8.0, < 8.14.0 cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

References for CVE-2025-4947

URL Tags
https://curl.se/docs/CVE-2025-4947.html Patch Vendor Advisory
https://curl.se/docs/CVE-2025-4947.json Vendor Advisory
https://hackerone.com/reports/3150884 Exploit Issue Tracking Patch
http://www.openwall.com/lists/oss-security/2025/05/28/4 Mailing List Patch Third Party Advisory
cvelogic Threat Intelligence