<s>
Follina	B-Error_Name
is	O
the	O
name	O
given	O
to	O
a	O
remote	O
code	O
execution	O
(	O
RCE	O
)	O
vulnerability	O
,	O
a	O
type	O
of	O
arbitrary	O
code	O
execution	O
(	O
ACE	O
)	O
exploit	O
,	O
in	O
the	O
Microsoft	B-General_Concept
Support	I-General_Concept
Diagnostic	I-General_Concept
Tool	I-General_Concept
(	O
MSDT	O
)	O
which	O
was	O
first	O
widely	O
publicized	O
on	O
May	O
27	O
,	O
2022	O
,	O
by	O
a	O
security	O
research	O
group	O
called	O
Nao	O
Sec	O
.	O
</s>
<s>
This	O
exploit	O
allows	O
a	O
remote	O
attacker	O
to	O
use	O
a	O
Microsoft	B-Application
Office	I-Application
document	O
template	O
to	O
execute	O
code	O
via	O
MSDT	O
.	O
</s>
<s>
This	O
works	O
by	O
exploiting	O
the	O
ability	O
of	O
Microsoft	B-Application
Office	I-Application
document	O
templates	O
to	O
download	O
additional	O
content	O
from	O
a	O
remote	O
server	O
.	O
</s>
<s>
If	O
the	O
size	O
of	O
the	O
downloaded	O
content	O
is	O
large	O
enough	O
it	O
causes	O
a	O
buffer	B-General_Concept
overflow	I-General_Concept
allowing	O
a	O
payload	O
of	O
Powershell	B-Application
code	O
to	O
be	O
executed	O
without	O
explicit	O
notification	O
to	O
the	O
user	O
.	O
</s>
<s>
Malicious	O
actors	O
have	O
been	O
observed	O
exploiting	O
the	O
bug	B-Error_Name
to	O
attack	O
computers	O
in	O
Russia	O
and	O
Belarus	O
since	O
April	O
,	O
and	O
it	O
is	O
believed	O
Chinese	O
state	O
actors	O
had	O
been	O
exploiting	O
it	O
to	O
attack	O
the	O
Tibetan	O
government	O
in	O
exile	O
based	O
in	O
India	O
.	O
</s>
