The vessel was attacked by two small boats and struck by multiple projectiles off Yemen's port city of Hodeidah on Wednesday morning, the Greek shipping ministry and the United Kingdom Maritime Trade Operations (UKMTO) said.
In a later update, the UKMTO said the Sounion had reported coming under renewed attack, causing a fire on board and causing the vessel to lose engine power and the ability to manoeuvre.
Delta Tankers, the ship's operator, confirmed the ship was adrift and had sustained minor damage. Its crew was assessing the situation and it would proceed on its journey, it said in a statement, declining to comment further.
There were no reports of injuries among the 25 crew members - two Russians and the rest Filipinos.
A maritime source told Reuters the vessel was expected to be able to sail "relying on its own means".
Iran-aligned Houthi militants have launched a series of attacks on international shipping near Yemen since last November in solidarity with Palestinians in the war between Israel and Hamas.
The Sounion reported being approached by two small craft with about 15 people on board and said there was a brief exchange of small arms fire during the incident 140 west of Hodeidah, the UMKTO said.
British security firm Ambrey separately reported another incident in the same area, saying "the vessel was engaged by small arms fire from two skiffs in a previous incident 10NM further south", it said, without naming the ship involved.
The attacks on shipping have drawn US and British retaliatory strikes on Houthi territories and disrupted global trade as ship owners reroute vessels away from the Red Sea and Suez Canal to sail the longer route around the southern tip of Africa.
22°C