Is CVE-2011-1563 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-1563, but active exploitation has not been confirmed.

Can CVE-2011-1563 be exploited remotely?

Yes. CVE-2011-1563 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-1563?

CVE-2011-1563 has a CVSS score of 10.0 (CRITICAL).

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CRITICALPOC

CVE-2011-1563

CWE-119Published: April 5, 2011· Updated: Jun 16, 2026

10.0

CVSS v3.1

Official Description

Multiple stack-based buffer overflows in the HMI application in DATAC RealFlex RealWin 2.1 (Build 6.1.10.10) and earlier allow remote attackers to execute arbitrary code via (1) a long username in an On_FC_CONNECT_FCS_LOGIN packet, and crafted (2) On_FC_CTAGLIST_FCS_CADDTAG, (3) On_FC_CTAGLIST_FCS_CDELTAG, (4) On_FC_CTAGLIST_FCS_ADDTAGMS, (5) On_FC_RFUSER_FCS_LOGIN, (6) unspecified "On_FC_BINFILE_FCS_*FILE", (7) On_FC_CGETTAG_FCS_GETTELEMETRY, (8) On_FC_CGETTAG_FCS_GETCHANNELTELEMETRY, (9) On_FC_CGETTAG_FCS_SETTELEMETRY, (10) On_FC_CGETTAG_FCS_SETCHANNELTELEMETRY, and (11) On_FC_SCRIPT_FCS_STARTPROG packets to port 910.

NVD Source

Technical Analysis

CVE-2011-1563 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2011-1563. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.