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Vulnerabilities

Vulnerability · CVE-2018-0495

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 pr

Published Jun 13, 2018 · catalog updated Oct 14, 2026 · Libgcrypt before 1.7.10 and

Check if you run it

No confirmed exploitation is on record for CVE-2018-0495. EPSS is 0.89%. Act only if a listed version of Libgcrypt before 1.7.10 and is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Libgcrypt before 1.7.10 and).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.89%
Remediation
Advisory link
Affected products
Debian:12 libgcrypt20 · Debian:13 libgcrypt20 · Debian:14 libgcrypt20 · cpe canonical/ubuntu linux · cpe debian/debian linux · cpe gnupg/libgcrypt

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 libgcrypt200 → 1.8.3-1
  • Debian:13 libgcrypt200 → 1.8.3-1
  • Debian:14 libgcrypt200 → 1.8.3-1
  • cpe canonical/ubuntu linux12.04
  • cpe canonical/ubuntu linux14.04
  • cpe canonical/ubuntu linux16.04
  • cpe canonical/ubuntu linux17.10
  • cpe canonical/ubuntu linux18.04
  • cpe canonical/ubuntu linux18.10
  • cpe debian/debian linux8.0
  • cpe gnupg/libgcryptversion unspecified
  • cpe oracle/traffic director11.1.1.9.0
  • cpe redhat/ansible tower3.3

How to fix CVE-2018-0495

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2018-0495. EPSS is 0.89%. Act only if a listed version of Libgcrypt before 1.7.10 and is installed.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 12.04; canonical/ubuntu linux 14.04; canonical/ubuntu linux 16.04; canonical/ubuntu linux 17.10. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-203: Observable Discrepancy. EPSS 0.89%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 13, 2018 · NIST NVD

    Detected

    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 virtu

  2. Oct 14, 2026 · NIST NVD

    Updated

    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 virtu

  3. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libgcrypt20 fixed in 1.8.3-1; libgcrypt20 fixed in 1.8.3-1; libgcrypt20 fixed in 1.8.3-1

  4. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libgcrypt20 fixed in 1.8.3-1

  5. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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 virtu

Sources

  • CVE.orgVulnerability recordCVE-2018-0495

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2018-0495

    30-day exploitation probability 0.9%

    first.org
  • NIST NVDVulnerability recordCVE-2018-0495

    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 Numbe

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2018-0495
    osv.dev

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.