lowREV. 01
CVE-2015-4000Logjam — Downgrade to Export-Grade Key Exchange
A server that still offers export-grade key exchange can be talked down to it by a network attacker, who then breaks the weakened key and reads or alters the connection.
Read the risk
THE VITAL STATS- CVSS score
- 3.7/ 10 CVSS v3.0
- EPSS probability
- 100% Likelihood of exploitation
- Attack complexity
- High Conditions needed to exploit
- Known exploited
- Not listed
- CVE published
- 2015-05-21
- Exploit published
- Not recorded
- Confidence
- high
- Kill chain
- credential access
- MITRE ATT&CK
- T1557
- Severity
- low
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attacker needsA position on the network path
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02Vendor advisoryoracle.comoracle.com
- 03Vendor advisoryoracle.comoracle.com
- 04Vendor advisoryopenssl.orgopenssl.org
- 05Vendor advisoryopenssl.orgopenssl.org
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-08-07 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-08-07 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-08-07 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.