Shauna Cleary, 25, sparked a link-up with inmate Kurt Jarman while working at privately-run HM Parc Prison in Bridgend, South Wales.
Jarman, 22, was serving a 10-year sentence after he brutally attacked a 77-year-old man with a Stanley knife during a terrifying ordeal in the pensioner’s home.
Brunette Cleary gave her number to the prisoner and sent him messages on a phone he had hidden in his cell, Cardiff Crown Court was told.
Prosecutor Joanna James said analysis revealed Jarman called Cleary in August last year and the relationship "gained momentum".
Cleary sent the prisoner two messages on October 1 but the content was not known.
She was arrested and her phone and laptop were seized.
The prison officer, from Pontypridd, South Wales, admitted misconduct in public office.
The court heard she had been working at the G4S-run jail from August 2016 to November 2017.
Judge Williams said she had been "terribly compromised and vulnerable to being manipulated".
Cleary was given a 16-week suspended prison sentence and ordered to do 15 days of rehabilitation activity.
Jarman was jailed in 2016 after he threatened to kill a pensioner, cut his neck with a Stanley knife, ransacked his house and marched him to a cash point.
The rugby player was drunk when he forced his way into the house in Machynlleth, Powys, and puched his victim to the floor.
Jarman admitted possessing a mobile phone inside prison and was jailed for a further six months.
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