Is CVE-2011-3491 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-3491, but active exploitation has not been confirmed.

Can CVE-2011-3491 be exploited remotely?

Yes. CVE-2011-3491 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-3491?

CVE-2011-3491 has a CVSS score of 10.0 (CRITICAL).

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CRITICALPOC

CVE-2011-3491

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

10.0

CVSS v3.1

Official Description

Heap-based buffer overflow in Progea Movicon / PowerHMI 11.2.1085 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a negative Content-Length field.

NVD Source

Technical Analysis

CVE-2011-3491 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-2011-3491. 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.