VDB-184207 · CVE-2021-27395 · ssa-766247

Siemens SIMATIC Process Historian 2020 missing authentication

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.1	$5k-$25k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Siemens SIMATIC Process Historian 2013, SIMATIC Process Historian 2014, SIMATIC Process Historian 2019 and SIMATIC Process Historian 2020. Affected by this issue is some unknown functionality. This manipulation causes missing authentication. This vulnerability is tracked as CVE-2021-27395. No exploit exists.

Detailsinfo

A vulnerability has been found in Siemens SIMATIC Process Historian 2013, SIMATIC Process Historian 2014, SIMATIC Process Historian 2019 and SIMATIC Process Historian 2020 (SCADA Software) (affected version not known) and classified as critical. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a missing authentication vulnerability. The CWE definition for the vulnerability is CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 10/12/2021 as ssa-766247. It is possible to read the advisory at cert-portal.siemens.com. This vulnerability is known as CVE-2021-27395 since 02/18/2021. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/12/2021).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

SCADA Software

Vendor

Siemens

Name

License

commercial

Website

Vendor: https://www.siemens.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.3
VulDB Temp Score: 6.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing authentication
CWE: CWE-306 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/18/2021 🔍
10/12/2021 +235 days 🔍
10/12/2021 +0 days 🔍
10/14/2021 +2 days 🔍

Sourcesinfo

Vendor: siemens.com

Advisory: ssa-766247
Status: Not defined

CVE: CVE-2021-27395 (🔍)
GCVE (CVE): GCVE-0-2021-27395
GCVE (VulDB): GCVE-100-184207

Entryinfo

Created: 10/12/2021 14:41
Updated: 10/14/2021 19:35
Changes: 10/12/2021 14:41 (37), 10/14/2021 19:35 (1)
Complete: 🔍
Cache ID: 216::103