Is CVE-2011-1547 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-1547, but active exploitation has not been confirmed.

Can CVE-2011-1547 be exploited remotely?

Yes. CVE-2011-1547 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-1547?

CVE-2011-1547 has a CVSS score of 6.8 (MEDIUM).

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MEDIUMPOC

CVE-2011-1547

CWE-119Published: May 9, 2011· Updated: Jun 16, 2026

6.8

CVSS v3.1

Official Description

Multiple stack consumption vulnerabilities in the kernel in NetBSD 4.0, 5.0 before 5.0.3, and 5.1 before 5.1.1, when IPsec is enabled, allow remote attackers to cause a denial of service (memory corruption and panic) or possibly have unspecified other impact via a crafted (1) IPv4 or (2) IPv6 packet with nested IPComp headers.

NVD Source

Technical Analysis

CVE-2011-1547 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-2011-1547. 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.