CVE-2018-0735

CVE-2018-0735 is a medium-severity vulnerability in Openssl with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

• Severity: Medium (CVSS 3.x base score 5.9)
• CVSS v2: 4.3
• EPSS exploit prediction: 5% (91st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-327
• Affected product: Openssl
• Published: 2018-10-29
• Last modified: 2026-06-17

Description

The OpenSSL ECDSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.1.1a (Affected 1.1.1).

Frequently asked questions

What is CVE-2018-0735?

The OpenSSL ECDSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.1.1a (Affected 1.1.1).

How severe is CVE-2018-0735?

CVE-2018-0735 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-0735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-0735?

CVE-2018-0735 primarily affects Openssl. In total, 42 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-0735?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-0735 published?

CVE-2018-0735 was published on 2018-10-29 and last updated on 2026-06-17.

References

• http://www.securityfocus.com/bid/105750
• http://www.securitytracker.com/id/1041986
• https://access.redhat.com/errata/RHSA-2019:3700
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=56fb454d281a023b3f950d969693553d3f3ceea1
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=b1d6d55ece1c26fa2829e2b819b038d7b6d692b4
• https://lists.debian.org/debian-lts-announce/2018/11/msg00024.html
• https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/
• https://security.netapp.com/advisory/ntap-20181105-0002/
• https://usn.ubuntu.com/3840-1/
• https://www.debian.org/security/2018/dsa-4348
• https://www.openssl.org/news/secadv/20181029.txt
• https://www.oracle.com/security-alerts/cpujan2020.html
• https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
• https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
• https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

Affected products (42)

• cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.1.1:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
• cpe:2.3:a:nodejs:node.js:10.13.0:*:*:*:lts:*:*:*
• cpe:2.3:o:netapp:cn1610_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:element_software:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:oncommand_unified_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:oncommand_unified_manager:*:*:*:*:*:vsphere:*:*
• cpe:2.3:a:netapp:santricity_smi-s_provider:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:smi-s_provider:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:snapdrive:-:*:*:*:*:unix:*:*
• cpe:2.3:a:netapp:snapdrive:-:*:*:*:*:windows:*:*
• cpe:2.3:a:netapp:steelstore:-:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:api_gateway:11.1.2.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:application_server:0.9.8:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:application_server:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:application_server:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_base_platform:12.1.0.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_base_platform:13.2.0.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_base_platform:13.3.0.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:12.3.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.55:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.56:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:8.4:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:15.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:15.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:16.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:16.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:18.8:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:secure_global_desktop:5.4:*:*:*:*:*:*:*

More vulnerabilities in Openssl

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• CVE-2021-3711 — Critical (CVSS 9.8): In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt().…
• CVE-2016-6309 — Critical (CVSS 9.8): statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote…

All CVEs affecting Openssl →

Other CWE-327 (Use of a Broken or Risky Cryptographic Algorithm) vulnerabilities

• CVE-2026-50086 — Critical (CVSS 10.0): The Aqara IAM/SSO gateway (gw-builder.aqara.com) exposes bidirectional AES round-trups against the platform's signing…
• CVE-2026-21718 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, enabling any attackers to…
• CVE-2025-54426 — Critical (CVSS 9.9): Polkadot Frontier is an Ethereum and EVM compatibility layer for Polkadot and Substrate. In versions prior to commit…
• CVE-2024-51478 — Critical (CVSS 9.9): YesWiki is a wiki system written in PHP. Prior to 4.4.5, the use of a weak cryptographic algorithm and a hard-coded…
• CVE-2026-28252 — Critical (CVSS 9.8): A Use of a Broken or Risky Cryptographic Algorithm vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge…
• CVE-2025-13476 — Critical (CVSS 9.8): Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0–v25.8.1.0 uses a static and predictable TLS…

Browse all CWE-327 (Use of a Broken or Risky Cryptographic Algorithm) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 124.223.78.215 (ipv4-addr)
• 85.95.166.40 (ipv4-addr)
• 180.76.184.79 (ipv4-addr)
• 122.176.122.24 (ipv4-addr)
• 159.253.22.85 (ipv4-addr)
• 120.55.5.49 (ipv4-addr)