5.6

CVE-2025-7396: Curve25519 Blinding

Analyzed
AliasesUBUNTU-CVE-2025-7396
Published 18-07-2025Last modified 21-07-2025

Vulnerability summary

CVE-2025-7396 is a medium (CVSS 5.6) Covert Timing Channel vulnerability in wolfssl. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.6, physical access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.6/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.22%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 18-07-2025
    PublishedVulnerability first disclosed.
  2. 21-07-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.19% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: physical access, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu1 product
  • wolfsslAll versions (No fix recorded)
Wolfssl1 product

2 vendors · 2 products

References

4 links