>ADC is configured to send syslog messages to external syslog server configured.
>It is found on syslog server, the syslog messages contains junk characters

Sep  1 01:08:09 <local0.debug> 10.1.1.1 09/01/2021:01:08:09 GMT gw-352658-011 0-PPE-0 : default AAATM Message 408434990 0 :  "Encoding URL as it has speical chars in redirect url </fullnews.php?id=%3Cscript%3Ealert(qualys);%3C/script%3E HTTP/1.0^M Host: 1.1.1.1^M Connection: Keep-Alive^M Qualys-Scan: EXT_Qualys_200^M clientip: 6.6.6.6^M Accept-Encoding: identity^M ^M rvicePort 4343 - ClientVersion TLSv1.2 - CipherSuite "TLS1-AES-256-CBC-SHA" - Session Reuse  - HandshakeTime 0 ms <C9>'r<A7>g<A3><F1><95><E8>D<95><C9>KI<A1><F9>B~^M^A<82>P<F2><9F>^SKH<D8><C6>I$^Mth<FF>^CuO<84><E0>^X<EA><86><C9>35<A9>2<DC>^T:hM<85><C8>/:<9F>^^^A<C1><99><A7>^E^V<A5><84><9E>-<92>{<86>D<AE><9F><9C><ED><CF><BD>(<A7>u^D56A<A4><E2><9F>1<E6>|<95>7nmaa(<B9><F3>1e^Z6<B3>^F<80><FF><97>J<FB><D9>E<EC>^\<D9>F^]<A8><9E><D2><E1><C4>^W+(Nr"<98>O<E9>U<B9>[t^\<FC>G<96>^X<EC>Qe^]"DC<A4><<BE><DB>h<97><E4><8B>l<BE><F1><B4><AD><C5><93><FE><B9>^[<FB><94>ki<81>^P<B2><94><D2>:^E<98>;<D1>2w<82><C3>^S<C3><8B><95>ML<D1><FE><F2>Z=<E6>@^LM<CD><A5><A9><DB>-oQ<B4><B2><D1>R<A7>g-<C5>c<8D>H<B0>Y<E8><A4>e^B8<FB><DB>}<AC>:<AA><AF>(<AB>4WkKq<BC><DE><C6><D5>H1#<D8>#<8A><EC><A0>><EF>^X3<CD>^V,Cv^X<C1>-<C2><F0><CC>Q<A2><E7><A9>R<D7>xP'<CC><D3><CC><9C> ^L<DF>J<D5><E8>ql^?<F3><A7>Z<FB>^L^X<DF><CB><8F>G;<9A>i<EA><DD><AD><CC><EC><AA><97><D3>^E<D7>^W<A3>x<D2>^Yv^Tp<BD><FD><C3><D7>H<C2><A7><D7>8<97><A6><DB>^M<9E>!<AB>1<E0>,<F0>\Y<8C><F6>\}<E1>o<96>t^GM<C5>^W2<90>f?<8D><92>^T2<C4>^Y<F4>R<E7>c<84><85><D3><9D><AD>~<D2>^Y<9B><F4>V   ^F<BA>^M<8A>^N<EE><CE><C6><D3>q<8A>[w<F8><8F><8C><A4>^G<FC>Iqo<CB><FB><CF><8F>z<FE><DE>g<B2>N<C9>_<E8><DB>^Y^U>}e<F4><BF>> length<56>"
 
Sep  1 01:08:09 <local0.debug> 10.1.1.1 09/01/2021:01:08:09 GMT gw-352658-011 0-PPE-0 : default AAATM Message 408435002 0 :  "Encoding URL as it has speical chars in redirect url </recipe_search.php?searchstring=<script>alert(document.domain);</script> HTTP/1.0^M Host: 1.1.1.1^M Connection: Keep-Alive^M Qualys-Scan: EXT_Qualys_200^M clientip: 6.6.6.6^M Accept-Encoding: identity^M ^M  ClientVersion TLSv1.2 - CipherSuite "TLS1-AES-256-CBC-SHA" - Session Reuse  - HandshakeTime 0 ms <C1><BA><AB><A4><96>b(<E9>d5e<EC><96>Q5<89>m9<^[1<D4><E6>V<C7><B8>#<E3>tb~^E<B4><ED><83>7<96><A0>^H<99>LH<86>;*^U^Q<DC>-^G!<B7><C1>        <E3>[M<D8>0C<AD><B4>H<DC>^[<C6><88>St<C1>^?<B4>JX<AD><97>(w*0<D6>2^B
<B1><D5><BA>o<D5>U<B7>V<8F><CB><D4><98>v<C6><81><F8>j<CB><8F><B4><AF>9<81>?V<B4><F5>^]<F4><92>N<E5>B=h<A2><ED><B6>(=<C1><D6>S7<DF><8C><9B><83>p<96><FD>g`<D8>S<87>0<CC>K<86><A8>,^\z^U<98>f<DE>1<95>`<EE>^Qw<8A><D0><C9>jc6<8F>)^A(<F0>S<EA>^<D7><99>5<9D>zt<EA><F9><C2>7<8A><C2><BC>7<F6><D1>^T<B6><95><F6><8E><BF>8<E8><9A>^P^\5^]^Ro<89><91>f<D3><BA>^X<BD><F5>UJ+^<C0><9D>Y,^A7+<AA>$<A4>]<98><F9><C0>^C^?D<91>Y<9E>O<EA>K<EA><DF>11<C9><B1>A<8A><BC><C2>^Z_<CB>I<CA><80><80>&<96><B0><CB>#|Rz<92>^H<D9>m<EB><B7><D1><B2><97>^M<8C>^B<85><DA>9<FA><A1><A7>t<82><B0>&^L<9B><AE>%w&<81><FB>^D<CF><D3><87><8B><80><E5><82>>"<F6><88>"~<A9>8vQ<9C>l^Z<8A>^D<8C>^Kn<A8><A7>`^^D<DE>E<BD>#<C5><9D>3^QvkH<85><B9>^_^]<B6><B0><E3>P<F3>,<B5>^U<A9>S\<AE><BD>Y<AF><81>^W<D1>Q<97>G<D2>

Problem Cause

The log is trying to print 'string' form of unprintable characters. UTF-8 charset has lot of character codes (numerical representation of characters) that are beyond readable characters. Attempting to print them with %s format specifier will result in such "junk"