Which products and versions are affected by CVE-2011-1563?

Affected: Realwin (Realflex) versions 1.06, 2.0. The full list is in the CVE brief.

Is CVE-2011-1563 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2011-1563 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2011-1563?

Public exploit code is available.

Is there a fix for CVE-2011-1563?

Fixed versions are available, including Realwin 2.1.

How urgently should CVE-2011-1563 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2011-1563

CriticalPublic exploit

Published Apr 5, 2011 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2011-1563 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Realwin (Realflex).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 75% probability of exploitation in the next 30 days.
Fixed versions are available, including Realwin 2.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

10.0

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

75%

Higher than 99.4% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2011-1563 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Affected Products

3 affected entries in total

Product	Affected versions	Fixed in
RealwinRealflex	1.06, 2.0	2.1

Patched Releases

Realwin

2.1

Timeline

Publicly disclosed
Apr 5, 2011
Last updated
Apr 28, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

advisory43848
advisoryADV-2011-0742
exploithttp://aluigi.org/adv/realwin_2-adv.txt
exploithttp://aluigi.org/adv/realwin_3-adv.txt
exploithttp://aluigi.org/adv/realwin_4-adv.txt

10 more references in the full CVE brief

FAQ

Common Questions.

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_C…
Affected: Realwin (Realflex) versions 1.06, 2.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Realwin 2.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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