CODESYS V2 Web Server prior 1.1.9.22 Web Request null pointer dereference

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in CODESYS V2 Web Server. Affected by this issue is some unknown functionality of the component Web Request Handler. The manipulation leads to null pointer dereference. This vulnerability is uniquely identified as CVE-2021-34586. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in CODESYS V2 Web Server (Web Server). It has been rated as problematic. This issue affects an unknown functionality of the component Web Request Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability.

The weakness was disclosed 10/26/2021. The advisory is shared at customers.codesys.com. The identification of this vulnerability is CVE-2021-34586 since 06/10/2021. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.1.9.22 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector (CERT@VDE): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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 Web Server 1.1.9.22

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-2021-34586 (🔍)
GCVE (CVE): GCVE-0-2021-34586
GCVE (VulDB): GCVE-100-185417

Entryinfo

Created: 10/26/2021 15:36
Updated: 08/15/2025 23:03
Changes: 10/26/2021 15:36 (49), 10/30/2021 16:09 (2), 10/30/2021 16:15 (7), 08/15/2025 23:03 (26)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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