Siemens RUGGEDCOM ROS M2100 up to 5.5.x TFTP unusual condition

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	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Siemens RUGGEDCOM ROS M2100, RUGGEDCOM ROS RMC8388, RUGGEDCOM ROS RS416v2, RUGGEDCOM ROS RS900G, RUGGEDCOM ROS RS900G, RUGGEDCOM ROS RSG2100, RUGGEDCOM ROS RSG2100P, RUGGEDCOM ROS RSG2100P, RUGGEDCOM ROS RSG2288, RUGGEDCOM ROS RSG2300, RUGGEDCOM ROS RSG2300P, RUGGEDCOM ROS RSG2488, RUGGEDCOM ROS RSG900, RUGGEDCOM ROS RSG920P, RUGGEDCOM ROS RSL910, RUGGEDCOM ROS RST2228, RUGGEDCOM ROS RST916C and RUGGEDCOM ROS RST916P up to 5.5.x. Affected is an unknown function of the component TFTP. This manipulation causes unusual condition. This vulnerability is tracked as CVE-2021-42020. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Siemens RUGGEDCOM ROS M2100, RUGGEDCOM ROS RMC8388, RUGGEDCOM ROS RS416v2, RUGGEDCOM ROS RS900G, RUGGEDCOM ROS RS900G, RUGGEDCOM ROS RSG2100, RUGGEDCOM ROS RSG2100P, RUGGEDCOM ROS RSG2100P, RUGGEDCOM ROS RSG2288, RUGGEDCOM ROS RSG2300, RUGGEDCOM ROS RSG2300P, RUGGEDCOM ROS RSG2488, RUGGEDCOM ROS RSG900, RUGGEDCOM ROS RSG920P, RUGGEDCOM ROS RSL910, RUGGEDCOM ROS RST2228, RUGGEDCOM ROS RST916C and RUGGEDCOM ROS RST916P up to 5.5.x. Affected by this vulnerability is some unknown processing of the component TFTP. The manipulation with an unknown input leads to a unusual condition vulnerability. The CWE definition for the vulnerability is CWE-754. The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product. As an impact it is known to affect availability.

The weakness was disclosed 03/08/2022 as ssa-256353. It is possible to read the advisory at cert-portal.siemens.com. This vulnerability is known as CVE-2021-42020 since 10/06/2021. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.6.0 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Siemens

Name

• RUGGEDCOM ROS M2100
• RUGGEDCOM ROS RMC8388
• RUGGEDCOM ROS RS416v2
• RUGGEDCOM ROS RS900G
• RUGGEDCOM ROS RS900G
• RUGGEDCOM ROS RSG900
• RUGGEDCOM ROS RSG920P
• RUGGEDCOM ROS RSG2100
• RUGGEDCOM ROS RSG2100P
• RUGGEDCOM ROS RSG2100P
• RUGGEDCOM ROS RSG2288
• RUGGEDCOM ROS RSG2300
• RUGGEDCOM ROS RSG2300P
• RUGGEDCOM ROS RSG2488
• RUGGEDCOM ROS RSL910
• RUGGEDCOM ROS RST916C
• RUGGEDCOM ROS RST916P
• RUGGEDCOM ROS RST2228

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5

License

• commercial

Website

• Vendor: https://www.siemens.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector: 🔍

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: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Unusual condition
CWE: CWE-754
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: RUGGEDCOM ROS M2100/RUGGEDCOM ROS RMC8388/RUGGEDCOM ROS RS416v2/RUGGEDCOM ROS RS900G/RUGGEDCOM ROS RS900G/RUGGEDCOM ROS RSG2100/RUGGEDCOM ROS RSG2100P/RUGGEDCOM ROS RSG2100P/RUGGEDCOM ROS RSG2288/RUGGEDCOM ROS RSG2300/RUGGEDCOM ROS RSG2300P/RUGGEDCOM ROS RSG2488/RUGGEDCOM ROS RSG900/RUGGEDCOM ROS RSG920P/RUGGEDCOM ROS RSL910/RUGGEDCOM ROS RST2228/RUGGEDCOM ROS RST916C/RUGGEDCOM ROS RST916P 5.6.0

Timelineinfo

10/06/2021 🔍
03/08/2022 +153 days 🔍
03/08/2022 +0 days 🔍
08/12/2025 +1253 days 🔍

Sourcesinfo

Vendor: siemens.com

Advisory: ssa-256353
Status: Confirmed

CVE: CVE-2021-42020 (🔍)
GCVE (CVE): GCVE-0-2021-42020
GCVE (VulDB): GCVE-100-194347

Entryinfo

Created: 03/08/2022 15:14
Updated: 08/12/2025 14:34
Changes: 03/08/2022 15:14 (40), 03/11/2022 08:24 (1), 08/12/2025 14:34 (42)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

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