Siemens Automation License Manager (ALM) 4.0 through 5.1+SP1+Upd1 allows remote attackers to cause a denial of service (NULL pointer derefe…

published 2012-01-08 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4457

cvss: 5.0; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 8.4%; EPSS 8.4% chance of exploitation in 30 days, percentile 95%
public exploits: 1; Exploit-DB

Siemens Automation License Manager (ALM) 4.0 through 5.1+SP1+Upd1 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via crafted content in a (1) get_target_ocx_param or (2) send_target_ocx_param command.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-11-361-01 updated 2025-06-09 cvss 5.0

Siemens Automation License Manager Vulnerabilities

Siemens Automation License Manager >=4.0, <5.1+SP1+Upd1, >=2.0, <5.1+SP1+Upd2
affected: mitigation “Customers of vulnerable versions of Siemens ALM should deploy the Siemens patch that Siemens sent out to its customers.”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Timeline

2011-11-28 First public exploit (EDB-18165)
2012-01-08 Published

Exploit prediction

8.41% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

EDB-18165 siemens automation license manager 500.0.122.1 - Multiple Vulnerabilities dos, 2011-11-28
aluigi.altervista.org http://aluigi.altervista.org/adv/almsrvx_1-adv.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-20 Improper Input Validation

References

aluigi.altervista.org /adv/almsrvx_1-adv.txt
exploit
support.automation.siemens.com /WW/llisapi.dll/57252401?func=ll&objId=57252401&objAction=csView&nodeid0=17323948&lang=en&siteid=cseus&aktprim
vendor-advisory
support.automation.siemens.com /WW/view/en/114358
us-cert.gov /control_systems/pdf/ICSA-11-361-01.pdf
us-government-resource

Sources

CVE List CVE-2011-4531
NVD CVE-2011-4531

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary