cURL up to 8.13.0 QUIC Certificate certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in cURL up to 8.13.0. This issue affects some unknown processing of the component QUIC Certificate Handler. Such manipulation leads to certificate validation. This vulnerability is traded as CVE-2025-4947. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in cURL up to 8.13.0 and classified as critical. Affected by this issue is some unknown functionality of the component QUIC Certificate Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. Using CWE to declare the problem leads to CWE-295. The product does not validate, or incorrectly validates, a certificate. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was shared by Hiroki Kurosawa. The advisory is shared for download at curl.se. This vulnerability is handled as CVE-2025-4947 since 05/19/2025. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1587.003.

The vulnerability scanner Nessus provides a plugin with the ID 237583 (Curl 8.8.0 < 8.14.0 Improper Certificate Validation (CVE-2025-4947)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.14.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (237583). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 237583
Nessus Name: Curl 8.8.0 < 8.14.0 Improper Certificate Validation (CVE-2025-4947)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: cURL 8.14.0

Timelineinfo

05/19/2025 CVE reserved
05/28/2025 +9 days Advisory disclosed
05/28/2025 +0 days VulDB entry created
05/30/2025 +2 days VulDB entry last update

Sourcesinfo

Advisory: curl.se
Researcher: Hiroki Kurosawa
Status: Confirmed

CVE: CVE-2025-4947 (🔒)
GCVE (CVE): GCVE-0-2025-4947
GCVE (VulDB): GCVE-100-310424

Entryinfo

Created: 05/28/2025 08:38
Updated: 05/30/2025 18:21
Changes: 05/28/2025 08:38 (56), 05/28/2025 14:24 (1), 05/30/2025 18:21 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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