4.7

CVE-2018-0495: canonical ubuntu_linux Observable Discrepancy

CVSS: 4.7v3.0MediumModified
AliasesALPINE-CVE-2018-0495MGASA-2018-0301MGASA-2018-0306
Published 13-06-2018Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2018-0495 is a medium (CVSS 4.7) Observable Discrepancy vulnerability in canonical ubuntu_linux. EPSS estimates a 0.89% chance of exploitation in the next 30 days, higher than 58.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
4.7/10
010
Medium · v3.0 (NVD)
EPSS score
0.89%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 13 · Related 7
OPENSUSE-SU-2024:10941-1OPENSUSE-SU-2024:11058-1RHSA-2018:3221RHSA-2019:1297RHSA-2019:2237RHSA-2020:1267

Timeline

  1. 13-06-2018
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.89%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

0.00 pp

From 0.89% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.89%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (nccgroup.trust)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Suse9 products
  • libgcrypt&distro=SUSE Linux Enterprise Desktop 12 SP3< 1.6.1-16.55.1 | < 1.6.1-16.62.1
  • libgcrypt&distro=SUSE Linux Enterprise Desktop 12 SP4< 1.6.1-16.62.1
  • libgcrypt&distro=SUSE Linux Enterprise Module for Basesystem 15< 1.8.2-6.3.1
  • libgcrypt&distro=SUSE Linux Enterprise Server 12 SP3< 1.6.1-16.55.1 | < 1.6.1-16.62.1
  • libgcrypt&distro=SUSE Linux Enterprise Server 12 SP4< 1.6.1-16.62.1
Ubuntu5 products
  • libgcrypt11< 1.5.3-2ubuntu4.6
  • libgcrypt20< 1.6.5-2ubuntu0.5 | < 1.8.1-4ubuntu1.1
  • nss< 2:3.28.4-0ubuntu0.14.04.4 | < 2:3.28.4-0ubuntu0.16.04.4 | < 2:3.35-2ubuntu2.1
  • openssl< 1.0.1f-1ubuntu2.26 | < 1.0.2g-1ubuntu4.13 | < 1.1.0g-2ubuntu4.1
  • openssl1.0< 1.0.2n-1ubuntu5.1
Redhat4 products
Mageia3 products
  • libgcrypt< 1.5.4-5.5.mga5
  • libgcrypt< 1.7.10-1.mga6
  • nss< 3.36.6-1.1.mga6
Alpine2 products
  • libgcrypt≥ 1.8.0, < 1.8.3-r0 | ≥ 1.8.0, < 1.7.10-r0
  • libressl< 2.7.4-r0 | < 2.6.5-r0
Debian2 products
  • libgcrypt20< 1.7.6-2+deb9u3 | < 1.6.3-2+deb8u5 | < 1.8.3-1
  • debian_linuxEOL8.0 | 9.0
Canonical1 product
  • ubuntu_linuxEOL12.04 | 14.04 | 16.04 | 17.10 | 18.04 | 18.10
Gnupg1 product
Oracle1 product

9 vendors · 28 products

References

46 links
Show all 46 references