#VU57343 Missing Authentication for Critical Function in Siemens products - CVE-2021-27395

Vulnerability identifier: #VU57343

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-27395

CWE-ID: CWE-306

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC Process Historian 2013
Other software / Other software solutions
SIMATIC Process Historian 2019
Other software / Other software solutions
SIMATIC Process Historian 2020
Other software / Other software solutions
SIMATIC Process Historian 2014
Other software / Other software solutions

Vendor: Siemens

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the software that is used for critical functionalities lacks authentication. A remote attacker can maliciously insert, modify or delete data.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC Process Historian 2013: All versions

SIMATIC Process Historian 2019: All versions

SIMATIC Process Historian 2020: All versions

SIMATIC Process Historian 2014: before SP3 Update 6

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-766247.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.