Is CVE-2011-4191 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-4191, but active exploitation has not been confirmed.

Can CVE-2011-4191 be exploited remotely?

Yes. CVE-2011-4191 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-4191?

CVE-2011-4191 has a CVSS score of 7.5 (HIGH).

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HIGHPOC

CVE-2011-4191

CWE-119Published: November 30, 2011· Updated: Jun 16, 2026

7.5

CVSS v3.1

Official Description

Stack-based buffer overflow in the xdrDecodeString function in XNFS.NLM in Novell NetWare 6.5 SP8 allows remote attackers to execute arbitrary code or cause a denial of service (abend or NFS outage) via long packets.

NVD Source

Technical Analysis

CVE-2011-4191 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-2011-4191. 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.