<s>
The	O
Nessus	B-Application
Attack	I-Application
Scripting	I-Application
Language	I-Application
,	O
usually	O
referred	O
to	O
as	O
NASL	O
,	O
is	O
a	O
scripting	B-Language
language	I-Language
that	O
is	O
used	O
by	O
vulnerability	O
scanners	O
like	O
Nessus	B-Protocol
and	O
OpenVAS	B-Protocol
.	O
</s>
<s>
Tens	O
of	O
thousands	O
of	O
plugins	O
have	O
been	O
written	O
in	O
NASL	O
for	O
Nessus	B-Protocol
and	O
OpenVAS	B-Protocol
.	O
</s>
<s>
For	O
the	O
exploitation	O
of	O
a	O
zero	O
day	O
attack	O
it	O
is	O
possible	O
for	O
an	O
end	O
user	O
of	O
Nessus	B-Protocol
or	O
OpenVAS	B-Protocol
to	O
write	O
custom	O
code	O
in	O
NASL	O
which	O
is	O
executed	O
by	O
these	O
vulnerability	O
scanners	O
.	O
</s>
<s>
In	O
earlier	O
versions	O
of	O
Nessus	B-Protocol
,	O
a	O
binary	O
called	O
nasl	O
or	O
nasl.exe	O
was	O
provided	O
that	O
could	O
interpret	O
NASL	O
code	O
to	O
perform	O
vulnerability	O
scans	O
.	O
</s>
<s>
In	O
later	O
versions	O
of	O
Nessus	B-Protocol
,	O
this	O
should	O
be	O
done	O
via	O
an	O
API	B-General_Concept
that	O
is	O
provided	O
by	O
this	O
software	O
.	O
</s>
<s>
If	O
the	O
plugin	O
,	O
in	O
this	O
example	O
myzeroday.nasl	O
,	O
is	O
placed	O
in	O
the	O
same	O
directory	O
where	O
other	O
NASL	O
plugins	O
are	O
located	O
,	O
it	O
can	O
also	O
be	O
included	O
in	O
standard	O
scans	O
by	O
Nessus	B-Protocol
or	O
OpenVAS	B-Protocol
,	O
via	O
the	O
Web	O
GUI	O
or	O
an	O
API	B-General_Concept
.	O
</s>
<s>
Many	O
of	O
the	O
specifications	O
of	O
the	O
formal	O
language	O
are	O
similar	O
to	O
those	O
of	O
the	O
programming	O
language	O
C	O
and	O
the	O
scripting	B-Language
language	I-Language
Perl	O
and	O
those	O
of	O
other	O
languages	O
.	O
</s>
<s>
In	O
the	O
release	O
notes	O
of	O
Nessus	B-Protocol
6.10.0	O
of	O
1/31/2017	O
,	O
a	O
new	O
NASL	O
compiler	O
for	O
faster	O
plugins	O
was	O
mentioned	O
.	O
</s>
