Last Modified: Jul 15, 2026
Affected Product(s):
F5OS F5OS-A, F5OS-C
Known Affected Versions:
F5OS-A 1.5.2, F5OS-A 1.5.3, F5OS-A 1.5.4, F5OS-A 1.8.0, F5OS-A 1.8.1, F5OS-A 1.8.2, F5OS-A 1.8.3, F5OS-A 1.8.4
Fixed In:
F5OS v2.0.0
Opened: Jul 31, 2025 Severity: 3-Major
EMS (extended_master_secret) extension is not present in F5OS-A versions 1.3.x and 1.4.x and F5OS-C versions 1.3.x,1.4.x,1.5.x
F5OS-A version < 1.5.x, Does not support EMS. F5OS-C version < 1.6.x, Does not support EMS.
Openssl 1.0.2q in the F5OS-A/C does not support EMS.
Upgrade to supported Openssl verison
F5OS-A versions 1.5.0 and above use OpenSSL version 1.0.2zc, which includes EMS support. Any version below 1.5.0 do not. F5OS-C versions 1.6.0 and above use OpenSSL version 1.0.2zc, which includes EMS support. Any version below 1.6.0 do not.