CVE•Published 2018-10-30•Modified 2026-10-08•1 article on news•6 live references•NVD data

CVE-2018-0734Openssl · Openssl

Vulnerability data via NVD (ingested)

CVSS v3.1

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS percentile

Exploit Prediction Scoring System · top 4% of all CVEs

Weaknesses (CWE)

CWE-327Use of a Broken or Risky Cryptographic Algorithm

Description

The OpenSSL DSA 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 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).

Timeline

Published 2018-10-30

Modified 2026-10-08

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag479,166 hosts

vuln:CVE-2018-0734

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Openssl Openssl"

All exposed Openssl Openssl instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Openssl"

HTTP body or banner mentions "Openssl" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2018-0734