The attack today took place in Khanaser, southeast Aleppo, a strategic region that links Aleppo with central and western Syria.
The military media arm says the IS attack was repelled.
The opposition Britain-based Syrian Observatory for Human Rights says IS fighters launched the attack on military posts in the area, triggering intense clashes and leaving many casualties.
IS-affiliated Aamaq news agency claimed IS fighters killed 30 government soldiers in the attack on Um Mayal village east of Khanaser.