Bug ID 503620: ECDHE_ECDSA and DHE_DSS ciphers do not work with OpenSSL 1.0.1k and later

Last Modified: Nov 07, 2022

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10, 11.5.2, 11.5.2 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.3

Opened: Jan 29, 2015

Severity: 2-Critical

Related Article: K16461


BIG-IP SSL when using ciphers ECDHE_ECDSA and DHE_DSS does not work consistently with OpenSSL clients using OpenSSL versions 1.0.1k or later.


SSL handshake failed. The OpenSSL clients might encounter a decryption error while reading the server key exchange.


When the ciphers used are ECDHE_ECDSA or DHE_DSS, and the OpenSSL clients have versions later than OpenSSL 1.0.1k.


Use OpenSSL versions earlier than OpenSSL 1.0.1k.

Fix Information

BIG-IP SSL now works well with ciphers ECDHE_ECDSA or DHE_DSS with OpenSSL client version OpenSSL 1.0.1k and later.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips