CVE-2021-27395 Missing authorization in SIMATIC Process Historian 2013 and earlier
An unauthenticated interface in Siemens SIMATIC Process Historian allows attackers to insert, modify, or delete critical data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-27395?
CVE-2021-27395 is a high-severity missing authorization vulnerability in Siemens SIMATIC Process Historian 2013 and earlier, published on 12 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been identified in SIMATIC Process Historian 2013 and earlier (All versions), SIMATIC Process Historian 2014 (All versions < SP3 Update 6), SIMATIC Process Historian 2019 (All versions), SIMATIC Process Historian 2020 (All versions). An interface in the software that is used for critical functionalities lacks authentication, which could allow a malicious user to maliciously insert, modify or delete data.
Weakness: CWE-306
Which versions are affected by CVE-2021-27395?
It affects 4 products.
Products include Siemens Simatic Process Historian 2013, Siemens Simatic Process Historian 2014, Siemens Simatic Process Historian 2019, Siemens Simatic Process Historian 2020.
How do I fix CVE-2021-27395?
No fix has been published for CVE-2021-27395 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-27395 being exploited?
There is no known exploitation of CVE-2021-27395 in the wild and no public exploit code.
Sources
Also known as GHSA-9j28-jmqh-8rph.