VDB-175804 · CVE-2021-30193 · GCVE-0-2021-30193

CODESYS prior 1.1.9.20 Web Server out-of-bounds write

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.
7.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in CODESYS. It has been declared as critical. This affects an unknown part of the component Web Server. Executing a manipulation can lead to out-of-bounds write. The identification of this vulnerability is CVE-2021-30193. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in CODESYS. It has been declared as critical. This vulnerability affects some unknown processing of the component Web Server. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared 05/25/2021. The advisory is shared for download at customers.codesys.com. This vulnerability was named CVE-2021-30193. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.1.9.20 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

CODESYS

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.6

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
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: CODESYS 1.1.9.20

Timelineinfo

04/07/2021 🔍
05/25/2021 +48 days 🔍
05/25/2021 +0 days 🔍
08/15/2025 +1543 days 🔍

Sourcesinfo

Advisory: customers.codesys.com
Status: Confirmed

CVE: CVE-2021-30193 (🔍)
GCVE (CVE): GCVE-0-2021-30193
GCVE (VulDB): GCVE-100-175804

Entryinfo

Created: 05/25/2021 21:14
Updated: 08/15/2025 22:33
Changes: 05/25/2021 21:14 (36), 05/29/2021 08:56 (5), 05/29/2021 09:01 (18), 08/15/2025 22:33 (16)
Complete: 🔍
Cache ID: 216::103