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Cisco Bug: CSCvt29230 - ESA: Misbehaviour in TLS Preferred fallback mechanism between DANE Opportunistic and None mode.

Last Modified

Jul 29, 2020

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

11.0.0-274 12.5.1-037

Description (partial)

Symptom:
Misbehaviour in TLS Preferred fallback mechanism between DANE Opportunistic and None mode was noted. 
The TLS Preferred should fall back to cleartext if there is no STARTTLS  and should not when TLS is offered and it failed. SMTP session fallback to cleartext if TLS FAILED and DANE None but not when DANE is in Opportunistic mode.

Conditions:
N/A
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