wolfSSL 5.8.0 Curve25519 information exposure

CVSS Meta Temp Score
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability was found in wolfSSL 5.8.0. It has been classified as problematic. This affects an unknown function of the component Curve25519 Handler. This manipulation causes information exposure. This vulnerability is handled as CVE-2025-7396. It is feasible to perform the attack on the physical device. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in wolfSSL 5.8.0. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component Curve25519 Handler. The manipulation with an unknown input leads to a information exposure vulnerability. The CWE definition for the vulnerability is CWE-203. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. As an impact it is known to affect confidentiality. The summary by CVE is:

In wolfSSL release 5.8.2 blinding support is turned on by default for Curve25519 in applicable builds. The blinding configure option is only for the base C implementation of Curve25519. It is not needed, or available with; ARM assembly builds, Intel assembly builds, and the small Curve25519 feature. While the side-channel attack on extracting a private key would be very difficult to execute in practice, enabling blinding provides an additional layer of protection for devices that may be more susceptible to physical access or side-channel observation.

The weakness was released by Arnaud Varillon, Laurent Sauvage and Allan Delautre. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-7396 since 07/09/2025. The exploitation appears to be difficult. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-21941). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.2
VulDB Meta Temp Score: 3.2

VulDB Base Score: 1.8
VulDB Temp Score: 1.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.6
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information exposure
CWE: CWE-203 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: Yes
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: github.com

Timelineinfo

07/09/2025 CVE reserved
07/19/2025 +10 days Advisory disclosed
07/19/2025 +0 days VulDB entry created
12/03/2025 +137 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Researcher: Arnaud Varillon, Laurent Sauvage, Allan Delautre
Status: Confirmed

CVE: CVE-2025-7396 (🔒)
GCVE (CVE): GCVE-0-2025-7396
GCVE (VulDB): GCVE-100-316951
EUVD: 🔒

Entryinfo

Created: 07/19/2025 05:47
Updated: 12/03/2025 17:08
Changes: 07/19/2025 05:47 (67), 07/19/2025 11:34 (1), 07/21/2025 18:06 (1), 12/03/2025 17:08 (11)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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