CVE•Published 2015-05-21•Modified 2026-05-27•1 article on news•6 live references•NVD data

CVE-2015-4000Openssl · Openssl

Vulnerability data via NVD (ingested)

CVSS v3.1

3.7

LOW

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

EPSS percentile

100

Exploit Prediction Scoring System · top 0% of all CVEs

Weaknesses (CWE)

CWE-310 CWE-295Improper Certificate Validation

Description

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

Timeline

Published 2015-05-21

Modified 2026-05-27

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 tag227,682 hosts

vuln:CVE-2015-4000

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-2015-4000