Format string vulnerability in the nn_exitmsg function in nn 6.6.0 through 6.6.3 allows remote NNTP servers to execute arbitrary code via format strings in server responses.
Exploitability
AV:NAC:LAu:NImpact
C:PI:PA:P7.5/AV:N/AC:L/Au:N/C:P/I:P/A:P