CODESYS V2 Runtime Toolkit/PLCWinNT prior 2.4.7.56 Request uninitialized pointer

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in CODESYS V2 Runtime Toolkit and PLCWinNT and classified as critical. This vulnerability affects unknown code of the component Request Handler. This manipulation causes uninitialized pointer. The identification of this vulnerability is CVE-2021-34596. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in CODESYS V2 Runtime Toolkit and PLCWinNT. Affected by this vulnerability is an unknown part of the component Request Handler. The manipulation with an unknown input leads to a uninitialized pointer vulnerability. The CWE definition for the vulnerability is CWE-824. The product accesses or uses a pointer that has not been initialized. As an impact it is known to affect availability.

The weakness was shared 10/26/2021. It is possible to read the advisory at customers.codesys.com. This vulnerability is known as CVE-2021-34596 since 06/10/2021. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.4.7.56 eliminates this vulnerability.

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

Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector (CERT@VDE): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Uninitialized pointer
CWE: CWE-824 / CWE-908
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: V2 Runtime Toolkit/PLCWinNT 2.4.7.56

Timelineinfo

06/10/2021 🔍
10/26/2021 +138 days 🔍
10/26/2021 +0 days 🔍
08/15/2025 +1389 days 🔍

Sourcesinfo

Advisory: customers.codesys.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-34596 (🔍)
GCVE (CVE): GCVE-0-2021-34596
GCVE (VulDB): GCVE-100-185419

Entryinfo

Created: 10/26/2021 15:37
Updated: 08/15/2025 23:03
Changes: 10/26/2021 15:37 (47), 10/30/2021 16:38 (2), 10/30/2021 16:45 (7), 08/15/2025 23:03 (25)
Complete: 🔍
Cache ID: 216::103

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

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