Description
MatrixSSL through 3.9.5 Open allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
References (1)
Core 1
Core References
Third Party Advisory x_refsource_misc
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
Scores
CVSS v3
4.7
EPSS
0.0027
EPSS Percentile
19.3%
Attack Vector
LOCAL
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Details
CWE
CWE-200
Status
published
Products (1)
matrixssl/matrixssl
< 3.9.5
Published
Jun 15, 2018
Tracked Since
Feb 18, 2026