CVE-2015-4000
The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, d…
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.
- Vendor
- openssl
- Product
- openssl
- CVSS 3.0
- 3.7 (low), scored by NVD (primary)CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- CVSS 3.1
- 3.7 (low), scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- Published
- 2015-05-21
- NVD modified
- 2026-06-17
- NVD status
- Modified
Not in the CISA KEV catalogue at the last update.
EPSS
100% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
References
- aix.software.ibm.com (Third Party Advisory)
- fortiguard.com (Third Party Advisory)
- ftp.netbsd.org (Mailing List, Third Party Advisory)
- h20564.www2.hpe.com (Third Party Advisory)
- h20564.www2.hpe.com (Third Party Advisory)
- kb.juniper.net (Third Party Advisory)
- kb.juniper.net (Third Party Advisory)
- lists.apple.com (Mailing List, Third Party Advisory)
- lists.apple.com (Mailing List, Third Party Advisory)
- lists.fedoraproject.org (Mailing List, Third Party Advisory)
- lists.fedoraproject.org (Mailing List, Third Party Advisory)
- lists.fedoraproject.org (Mailing List, Third Party Advisory)
Data last updated 18 Oct 2026. Sources: NVD API 2.0, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.