Low (3.7) in openssl openssl. EPSS 84% chance of exploitation in the next 30 days.
The DH_check_pub_key function in crypto/dh/dh_check.c in OpenSSL 1.0.2 before 1.0.2f does not ensure that prime numbers are appropriate for Diffie-Hellman (DH) key exchange, which makes it easier for remote attackers to discover a private DH exponent by making multiple handshakes with a peer that chose an inappropriate number, as demonstrated by a number in an X9.42 file.
Severity
CVSS 3.0
3.7 low
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
84% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)