CVE-2021-25659 Denial of service in Automation License Manager 5
Attackers can cause denial of service by sending crafted packets to the Automation License Manager, exhausting memory and blocking legitimate users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-25659?
CVE-2021-25659 is a high-severity denial of service vulnerability in Siemens Automation License Manager 5, published on 10 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions < V6.0 SP9 Update 2). Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.
Weakness: CWE-400
Which versions are affected by CVE-2021-25659?
It affects 1 product.
Products include Siemens Automation License Manager.
How do I fix CVE-2021-25659?
No fix has been published for CVE-2021-25659 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-25659 being exploited?
There is no known exploitation of CVE-2021-25659 in the wild and no public exploit code.
Other vulnerabilities in Siemens Automation License Manager 5
- CVE-2016-8565 Missing authorization in n/a
- CVE-2018-11455 Path traversal in Automation License Manager 5, Automation License Manager 6
- CVE-2022-43513 Path traversal in Automation License Manager V5
- CVE-2020-7583 Missing authorization in Automation License Manager 5
- CVE-2022-43514 Path traversal in Automation License Manager V5
Sources
Also known as GHSA-qhxf-2fw5-w33w.