CVE-2025-7396

Private-key extraction via unblinded Curve25519 operations

Published Jul 18, 2025 · Updated Jul 21, 2025

Physical side-channel exposure in wolfSSL 5.8.0 allows physically proximate attackers to extract Curve25519 private keys. The base C implementation performs private-key scalar multiplication without blinding in the affected operations, leaving power or electromagnetic traces correlated with secret values. Exploitation requires specialized measurement equipment and an applicable base-C build; ARM or Intel assembly, small-footprint Curve25519, and hardware-offload builds are unaffected.

CVSS severity5.6
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Physical side-channel exposure in wolfSSL 5.8.0 allows physically proximate attackers to extract Curve25519 private keys. The base C implementation performs private-key scalar multiplication without blinding in the affected operations, leaving power or electromagnetic traces correlated with secret values. Exploitation requires specialized measurement equipment and an applicable base-C build; ARM or Intel assembly, small-footprint Curve25519, and hardware-offload builds are unaffected.

The record

CVE
CVE-2025-7396
Published
Jul 18, 2025
Updated
Jul 21, 2025
Vendor
wolfSSL
Product
wolfSSL
Classifications
CWE-385
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8.0; 0

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

wolfSSL · wolfSSLversion=5.8.0; 0

Published CVSS scores

4.6NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.6wolfSSL Inc.CVSS:4.0/AV:P/AC:H/AT:P/PR:L/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-385Covert Timing Channel

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo