CVE-2018-0735: Timing attack against ECDSA signature generation
Vulnerability summary
CVE-2018-0735 is a medium (CVSS 5.9) vulnerability in canonical ubuntu_linux. EPSS estimates a 4.72% chance of exploitation in the next 30 days, higher than 91.8% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 6Timeline
- 29-10-2018PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
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).
CVSS metrics
7 scores · 5 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · ChainguardEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
4.72%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.72% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Oracle10 products
- api_gateway11.1.2.4.0
- application_server0.9.8 | 1.0.0 | 1.0.1
- enterprise_manager_base_platform12.1.0.5.0 | 13.2.0.0.0 | 13.3.0.0.0
- enterprise_manager_ops_center12.3.3
- mysql≤ 5.6.42 | ≥ 5.7.0, ≤ 5.7.24 | ≥ 8.0.0, ≤ 8.0.13
Netapp8 products
- cloud_backupna
- cn1610_firmwarena
- element_softwarena
- oncommand_unified_manager≥ 9.4 (No fix recorded)
- santricity_smi-s_providerna
Chainguard6 products
- mysql-8.0< 8.0.38-r0
- mysql-8.0-client< 8.0.38-r0
- mysql-8.0-dev< 8.0.38-r0
- mysql-8.0-iamguarded-compat< 8.0.38-r0
- mysql-8.0-oci-entrypoint< 8.0.38-r0
Alpine5 products
- nodejs< 10.14.0-r0
- nodejs-current< 11.3.0-r0
- openssl≥ 1.1.0, < 1.1.1a-r0
- openssl1.1-compat< 1.1.1a-r0
- openssl3< 1.1.1a-r0
Debian2 products
- openssl< 1.1.1a-1
- debian_linuxEOL8.0 | 9.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
Nodejs1 product
- node.jsEOL≥ 10.0.0, < 10.12.0 | ≥ 11.0.0, < 11.3.0 | 10.13.0
Openssl1 product
- opensslEOLFixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i) | Fixed in OpenSSL 1.1.1a (Affected 1.1.1) | ≥ 1.1.0, ≤ 1.1.0i | 1.1.1
Ubuntu1 product
- openssl< 1.1.0g-2ubuntu4.3
9 vendors · 35 products
References
20 links- www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlX Refsource CONFIRMPatchThird Party AdvisoryFIX
- nodejs.org/en/blog/vulnerability/november-2018-security-releases/X Refsource CONFIRMThird Party AdvisoryAdvisory
lists.debian.org/debian-lts-announce/2018/11/msg00024.htmlMailing ListX Refsource MLISTThird Party AdvisoryAdvisory
Show all 20 references
- www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlX Refsource MISCPatchThird Party AdvisoryFIX
- www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlX Refsource MISCPatchThird Party AdvisoryFIX
- access.redhat.com/errata/RHSA-2019:3700Vendor AdvisoryX Refsource REDHATThird Party AdvisoryAdvisory