Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2018-0495

CVE-2018-0495MEDIUM

n/a Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 — Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated throug…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   H   L   N  U  H  N  N    4.7   .0089   58.6     —

AFFECTED
  Product                                         Versions                                          Fixed
  Libgcrypt before 1.7.10 and 1.8.x before 1.8.3  Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 –  —

TIMELINE
  Nov 27  Reserved by debian
  Jun 13  Published (CNA: debian)
  Oct 14  ENRICHED — CVE-2018-0495 (Libgcrypt before 1.7.10 and 1.8.x before 1.8.3). Received CVSS 4.7 and CPE data from NVD.
  Oct 14  EXPLOIT PUBLISHED — CVE-2018-0495 (Libgcrypt before 1.7.10 and 1.8.x before 1.8.3). Public exploit reference added.

CWE-203 · CNA: debian · CVSS v3.0 · 22 references · NVD status: Modified

Description

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, 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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
November 27, 2017	Reserved	Reserved by debian
June 13, 2018	Published	Published (CNA: debian)
October 14, 2026	ENRICHED	ENRICHED — CVE-2018-0495 (Libgcrypt before 1.7.10 and 1.8.x before 1.8.3). Received CVSS 4.7 and CPE data from NVD.
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2018-0495 (Libgcrypt before 1.7.10 and 1.8.x before 1.8.3). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	Libgcrypt before 1.7.10 and 1.8.x before 1.8.3	—	Libgcrypt before 1.7.10 and 1.8.x before 1.8.3	—

Weaknesses

CWE-203

References (22)

http://www.securitytracker.com/id/1041144 [Third Party Advisory, VDB Entry]
http://www.securitytracker.com/id/1041147 [Third Party Advisory, VDB Entry]
https://access.redhat.com/errata/RHSA-2018:3221 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2018:3505 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1296
https://access.redhat.com/errata/RHSA-2019:1297
https://access.redhat.com/errata/RHSA-2019:1543
https://access.redhat.com/errata/RHSA-2019:2237
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://dev.gnupg.org/T4011 [Patch, Vendor Advisory]
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=9010d1576e278a4274ad3f4aa15776c28f6ba965
https://lists.debian.org/debian-lts-announce/2018/06/msg00013.html [Mailing List, Third Party Advisory]
https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.html [Vendor Advisory]
https://usn.ubuntu.com/3689-1/ [Third Party Advisory]
https://usn.ubuntu.com/3689-2/ [Third Party Advisory]
https://usn.ubuntu.com/3692-1/ [Third Party Advisory]
https://usn.ubuntu.com/3692-2/ [Third Party Advisory]
https://usn.ubuntu.com/3850-1/ [Third Party Advisory]
https://usn.ubuntu.com/3850-2/ [Third Party Advisory]
https://www.debian.org/security/2018/dsa-4231 [Third Party Advisory]
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ [Exploit, Third Party Advisory]
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html [Patch, Third Party Advisory]

Authoritative record: CVE-2018-0495 at cve.org

Weaknesses: CWE-203

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2018-0495 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.