What is CVE-2011-3486?

CVE-2011-3486 is a vulnerability in Beckhoff Twincat, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-09-16.

Is CVE-2011-3486 known to be exploited?

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

Buffer overflow in Beckhoff Twincat

CVE-2011-3486

Beckhoff TwinCAT 2.11.0.2004 and earlier allows remote attackers to cause a denial of service via a crafted request to UDP port 48899, which triggers an out-of-bounds read.

Vulnerability class: Buffer Overflow

Published 2011-09-16 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.496 (98.9th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.496 · newest: 0.496 · change: 0.000

Affected products

Beckhoff Twincat — versions 2.7, 2.8, 2.9

Weakness classification (CWE)

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

Public proof-of-concept exploits

rapid7/metasploit-framework

References

exchange.xforce.ibmcloud.com/vulnerabilities/69765 (vdb-entry)
securityreason.com/securityalert/8380 (third-party-advisory)
www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-256-06.pdf (US Government Resource)
osvdb.org/75495 (vdb-entry)
aluigi.altervista.org/adv/twincat_1-adv.txt (Exploit)

Frequently asked questions

What is CVE-2011-3486?: CVE-2011-3486 is a vulnerability in Beckhoff Twincat, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-09-16.
Is CVE-2011-3486 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.