CVE-2015-4000

LOWNVD 3.79.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 94% probability of exploitation within the next 30 days (top 0.1% of all CVEs). NVD baseline CVSS 3.7 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
3.7
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 100%
CISA-KEV: Not listedEPSS: 100%CVSS: 3.7Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
3.7
EG Score
9.0(high)
EPSS
100.0%
KEV
Not listed

Published

May 21, 2015

Last Modified

May 27, 2026

References (434)

Vendor Advisories for CVE-2015-4000(18)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenjdk-6-jre-lib (6b36-1.13.8-0ubuntu1~12.04) @ precise2026-05-23ubuntu
ubuntuopenjdk-7-jre-zero (7u79-2.5.6-0ubuntu1.15.04.1) @ vivid2026-05-23ubuntu
ubuntufirefox (39.0+build5-0ubuntu0.14.10.1) @ utopic2026-05-23ubuntu
ubuntufirefox (39.0+build5-0ubuntu0.12.04.2) @ precise2026-05-23ubuntu
ubuntuopenjdk-7-jre (7u79-2.5.6-0ubuntu1.14.04.1) @ trusty2026-05-23ubuntu
ubuntuthunderbird (1:31.8.0+build1-0ubuntu0.15.04.1) @ vivid2026-05-23ubuntu
redhatopenssl2016-10-12redhat
redhatpatch2016-08-17redhat
redhatjava-1.6.0-ibm-1:1.6.0.16.7-1jpp.1.el6_72015-08-12redhat
redhatjava-1.5.0-ibm-1:1.5.0.16.13-1jpp.3.el6_72015-08-04redhat
redhatjava-1.6.0-openjdk-1:1.6.0.36-1.13.8.1.el7_12015-07-30redhat
redhatjava-1.7.0-ibm-1:1.7.0.9.10-1jpp.2.el52015-07-23redhat
redhatjava-1.7.1-ibm-1:1.7.1.3.10-1jpp.1.ael7b_12015-07-22redhat
redhatjava-1.8.0-oracle-1:1.8.0.51-1jpp.2.el7_12015-07-17redhat
redhatjava-1.6.0-sun-1:1.6.0.101-1jpp.1.el7_12015-07-17redhat
redhatjava-1.7.0-oracle-1:1.7.0.85-1jpp.2.el7_12015-07-17redhat
redhatjava-1.7.0-openjdk-1:1.7.0.85-2.6.1.2.ael7b_12015-07-15redhat
redhatjava-1.8.0-openjdk-1:1.8.0.51-1.b16.ael7b_12015-07-15redhat
redhatjava-1.7.0-openjdk-1:1.7.0.85-2.6.1.3.el5_112015-07-15redhat
redhatopenssl-0:0.9.8e-36.el5_112015-06-30redhat
redhatnss-util-0:3.19.1-1.ael7b_12015-06-25redhat
redhatopenssl-1:1.0.1e-42.ael7b_1.62015-06-04redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 0× in last 7d / 6× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 17:37 UTCOSV refresh
  2. 2026-07-06 16:24 UTCEPSS rescore
  3. 2026-07-06 02:20 UTCEPSS rescore
  4. 2026-06-24 14:02 UTCEPSS rescore
  5. 2026-06-24 14:02 UTCEPSS rescore
  6. 2026-06-24 00:29 UTCOSV refresh
  7. 2026-06-15 17:45 UTCEPSS rescore
  8. 2026-06-12 23:09 UTCEPSS rescore
  9. 2026-06-07 15:22 UTCEPSS rescore
  10. 2026-06-07 06:55 UTCOSV refresh
  11. 2026-06-05 22:44 UTCEPSS rescore
  12. 2026-06-04 13:10 UTCEPSS rescore
  13. 2026-06-04 13:09 UTCEPSS rescore
  14. 2026-05-31 00:14 UTCEPSS rescore
  15. 2026-05-28 13:42 UTCEPSS rescore
  16. 2026-05-28 13:42 UTCEPSS rescore
  17. 2026-05-26 07:16 UTCEPSS rescore
  18. 2026-05-26 07:16 UTCEPSS rescore
  19. 2026-05-24 16:43 UTCEPSS rescore
  20. 2026-05-23 01:23 UTCEG score recompute
  21. 2026-05-23 01:23 UTCVendor advisory
  22. 2026-05-23 01:23 UTCGHSA enrichment
  23. 2026-05-18 21:30 UTCEPSS rescore
  24. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCfatlan/HAProxy-Keepalived-Sec-HighLoads
    First seen Apr 24, 2021

    ✨ HAProxy ve Keepalived konusunu load balancer ve cluster'a ek olarak güvenlik(zayıf SSL/Kripto Kullanımı (LOGJAM) (CVE-2015-4000) zafiyeti önlemi) ve yüksek yüklere karşı ele alır.

    Open source ↗
  • Metasploitauxiliary/scanner/ssl/ssl_version✓ verified
    First seen Oct 14, 2014

    SSL/TLS Version Detection

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2015-4000?
CVE-2015-4000 is a low vulnerability published on May 21, 2015. The TLS protocol 1.2 and earlier, when a DHEEXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHEEXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHEEXPORT and then…
When was CVE-2015-4000 disclosed?
CVE-2015-4000 was first published in the National Vulnerability Database on May 21, 2015, with the most recent update on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-4000 actively exploited?
CVE-2015-4000 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 100.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-4000?
CVE-2015-4000 has a CVSS v3 base score of 3.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2015-4000?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-4000, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2015-4000

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