# CVE-2018-0495: libgcrypt20: 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...

CVE-2018-0495 is fixed in 7 products on 1 platform, first by libgcrypt20 1.8.1-4ubuntu1.1, released June 12, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-0495
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0087
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 12, 2018

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libgcrypt20 Ubuntu 18.04.6 LTS (bionic) | 1.8.1-4ubuntu1.1 | [libgcrypt20 1.8.1-4ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libgcrypt20-1.8.1-4ubuntu1.1.md) | Jun 12, 2018 |
| Linux | libnss3 Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.1 | [libnss3 2:3.35-2ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-2-3.35-2ubuntu2.1.md) | Dec 11, 2018 |
| Linux | libnss3-tools Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.1 | [libnss3-tools 2:3.35-2ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-tools-2-3.35-2ubuntu2.1.md) | Dec 11, 2018 |
| Linux | libssl1.0.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.1 | [libssl1.0.0 1.0.2n-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.1.md) | Jun 12, 2018 |
| Linux | libssl1.1 Ubuntu 18.04.6 LTS (bionic) | 1.1.0g-2ubuntu4.1 | [libssl1.1 1.1.0g-2ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.1-1.1.0g-2ubuntu4.1.md) | Jun 12, 2018 |
| Linux | openssl Ubuntu 18.04.6 LTS (bionic) | 1.1.0g-2ubuntu4.1 | [openssl 1.1.0g-2ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.1.0g-2ubuntu4.1.md) | Jun 12, 2018 |
| Linux | openssl1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.1 | [openssl1.0 1.0.2n-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.1.md) | Jun 12, 2018 |

---

Data as of 2026-11-11T07:45:43Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.