3.7 Low
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
0.975 High
EPSS
Percentile
100.0%
Security researcher Matthew Green reported a Diffie–Hellman (DHE) key processing issue in Network Security Services (NSS) where a man-in-the-middle (MITM) attacker can force a server to downgrade TLS connections to 512-bit export-grade cryptography by modifying client requests to include only export-grade cipher suites. The resulting weak key can then be leveraged to impersonate the server. This attack is detailed in the “Imperfect Forward Secrecy: How Diffie-Hellman Fails in Practice” paper and is known as the “Logjam Attack.”
CPE | Name | Operator | Version |
---|---|---|---|
firefox | lt | 39 | |
firefox esr | lt | 31.8 | |
firefox esr | lt | 38.1 | |
firefox os | lt | 2.2 | |
seamonkey | lt | 2.35 | |
thunderbird | lt | 31.8 | |
thunderbird | lt | 38.1 |
3.7 Low
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
0.975 High
EPSS
Percentile
100.0%