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Vulnerability record · CVE-2018-12439 · published 15 June 2018

CVE-2018-12439: Matrixssl information exposure vulnerability

MMatrixssl · Matrixssl

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.

4.7 CVSS 3.0 Medium EPSS 0.27% · top 82.0% CWE-200 · Information exposure
4.7CVSS 3.0 base score, v2 1.9
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ Third Party Advisory
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-43974Matrixssl integer overflow vulnerabilityMatrixSSL 4.0.4 through 4.5.1 has an integer overflow in matrixSslDecodeTls13. A remote attacker might be able to send a crafted TLS Message to cause…EPSS 1.7%9.8CVE-2019-14431Matrixssl out-of-bounds write vulnerabilityIn MatrixSSL 3.8.3 Open through 4.2.1 Open, the DTLS server mishandles incoming network messages leading to a heap-based buffer overflow of up to 256…EPSS 3.6%9.8CVE-2019-13470Matrixssl out-of-bounds read vulnerabilityMatrixSSL before 4.2.1 has an out-of-bounds read during ASN.1 handling.EPSS 1.6%9.8CVE-2019-10914Matrixssl improper certificate validation vulnerabilitypubRsaDecryptSignedElementExt in MatrixSSL 4.0.1 Open, as used in Inside Secure TLS Toolkit, has a stack-based buffer overflow during X.509 certifica…EPSS 1.4%9.8CVE-2017-2780Matrixssl out-of-bounds write vulnerabilityAn exploitable heap buffer overflow vulnerability exists in the X509 certificate parsing functionality of InsideSecure MatrixSSL 3.8.7b. A specially …EPSS 2.3%9.8CVE-2017-2781Matrixssl out-of-bounds write vulnerabilityAn exploitable heap buffer overflow vulnerability exists in the X509 certificate parsing functionality of InsideSecure MatrixSSL 3.8.7b. A specially …EPSS 2.3%9.8CVE-2016-6890Matrixssl memory buffer overflow vulnerabilityHeap-based buffer overflow in MatrixSSL before 3.8.6 allows remote attackers to execute arbitrary code via a crafted Subject Alt Name in an X.509 cer…EPSS 6.4%9.1CVE-2017-2782Matrixssl integer overflow vulnerabilityAn integer overflow vulnerability exists in the X509 certificate parsing functionality of InsideSecure MatrixSSL 3.8.7b. A specially crafted x509 cer…EPSS 1.0%

Source: NIST National Vulnerability Database (record CVE-2018-12439), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.