Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Tor v0.2.0.28, y posiblemente v0.2.0.34 y anteriores, permite a atacantes remotos, con el control de un enrutador de salida y otro de entrada, confirmar que un receptor y un remitente estan comunicandose a traves de los vectores (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, y despues observar los errores de reconocimiento de celula en el enrutador de salida. NOTA: El vendedor no esta de acuerda con la importancia de este hecho.