How severe is CVE-2016-8563?

CVE-2016-8563 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-8563 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-8563?

CVE-2016-8563 affects Siemens Automation License Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-8563?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-8563 published?

CVE-2016-8563 was published on 2016-10-13 and last updated on 2026-06-17.

CVE-2016-8563

CVE-2016-8563 is a high-severity vulnerability in Siemens Automation License Manager with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Siemens Automation License Manager
Published: 2016-10-13
Last modified: 2026-06-17

Description

Siemens Automation License Manager (ALM) before 5.3 SP3 Update 1 allows remote attackers to cause a denial of service (ALM service outage) via crafted packets to TCP port 4410.

Frequently asked questions

What is CVE-2016-8563?: Siemens Automation License Manager (ALM) before 5.3 SP3 Update 1 allows remote attackers to cause a denial of service (ALM service outage) via crafted packets to TCP port 4410.
How severe is CVE-2016-8563?: CVE-2016-8563 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-8563 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-8563?: CVE-2016-8563 affects Siemens Automation License Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-8563?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-8563 published?: CVE-2016-8563 was published on 2016-10-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:siemens:automation_license_manager:*:sp3:*:*:*:*:*:*

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