What is CVE-2011-1563?

CVE-2011-1563 is a vulnerability in Realflex Realwin, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-04-05.

Is CVE-2011-1563 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Realflex Realwin

CVE-2011-1563

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.

Vulnerability class: Buffer Overflow

Published 2011-04-05 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 10.0 (High). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.746 (99.5th percentile), scored 2026-10-19.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.746 · newest: 0.746 · change: 0.000

Affected products

Realflex Realwin — versions 1.06, 2.0

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

www.securityfocus.com/bid/46937 (vdb-entry)
aluigi.org/adv/realwin_2-adv.txt (Exploit)
aluigi.org/adv/realwin_7-adv.txt (Exploit)
www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-080-04.pdf (US Government Resource)
www.exploit-db.com/exploits/17025 (Exploit, exploit)
aluigi.org/adv/realwin_4-adv.txt (Exploit)
secunia.com/advisories/43848 (Vendor Advisory, third-party-advisory)
www.vupen.com/english/advisories/2011/0742 (vdb-entry, Vendor Advisory)
aluigi.org/adv/realwin_8-adv.txt (Exploit)
aluigi.org/adv/realwin_5-adv.txt (Exploit)

Frequently asked questions

What is CVE-2011-1563?: CVE-2011-1563 is a vulnerability in Realflex Realwin, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-04-05.
Is CVE-2011-1563 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.