What is CVE-2011-5033?

CVE-2011-5033 is a vulnerability in Configserver Security Firewall, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-12-29.

Is CVE-2011-5033 known to be exploited?

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

Buffer overflow in Configserver Security Firewall

CVE-2011-5033

Stack-based buffer overflow in CFS.c in ConfigServer Security & Firewall (CSF) before 5.43, when running on a DirectAdmin server, allows local users to cause a denial of service (crash) via a long string in an admin.list file.

Vulnerability class: Buffer Overflow

Published 2011-12-29 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 4.4 (Medium). Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.007 (50.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Configserver Security Firewall — versions 5.00, 5.01, 5.02
Directadmin Server

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

www.configserver.com/free/csf/changelog.txt
exchange.xforce.ibmcloud.com/vulnerabilities/71758 (vdb-entry)
www.exploit-db.com/exploits/18225 (Exploit, exploit)
forum.configserver.com/viewtopic.php

Frequently asked questions

What is CVE-2011-5033?: CVE-2011-5033 is a vulnerability in Configserver Security Firewall, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-12-29.
Is CVE-2011-5033 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.