CVE-2018-12434

Name: CVE-2018-12434
Creator: NVD / NIST
Published: 2018-06-15T02:29:00.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.32%

Last modified Jun 17, 2026

CVE-2018-12434 is a vulnerability of currently unknown severity. LibreSSL before 2.6.5 and 2.7.x before 2.7.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

LibreSSL before 2.6.5 and 2.7.x before 2.7.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Metrics

EPSS Probability

0.32%

23.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Openbsd	Libressl	< 2.6.5
Openbsd	Libressl	2.7.0
Openbsd	Libressl	2.7.1
Openbsd	Libressl	2.7.2
Openbsd	Libressl	2.7.3

References

https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txtVendor Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txtVendor Advisory
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/Third Party Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txtVendor Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txtVendor Advisory
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/Third Party Advisory

Timeline

Published: Jun 15, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12434?

How severe is CVE-2018-12434?

Severity scoring for CVE-2018-12434 is pending analysis. The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12434?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-12434?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST