CVE-2022-31803

mediumpriority · track · 20EPSS 0.012 · 67 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
1.16% (67th) EPSS
CVSS 5 · medium
Is it mine?
36 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cisa_csaf_ot · festo_psirt

EPSS · scored 2026-10-27

In CODESYS Gateway Server V2 an insufficient check for the activity of TCP client connections allows an unauthenticated attacker to consume all available TCP connections and prevent legitimate users or clients from establishing a new connection to the CODESYS Gateway Server V2. Existing connections are not affected and therefore remain intact.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedwago_psirt

    WAGO recommends that all affected users with WAGO I/O-PRO/CODESYS 2.3 PLCs update to the firmware and use the latest version of WAGO I/O-Pro as soon as it is available. Until the updates are available, we recommend switching off the CODESYS IP port 2455 after commissioning or, if this not possible, use a strong admin password. ### PFC200 Family | Ord. No. | Firmware | |-----------------------|----------------------------------| | 750-8202/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8203/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8204/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8206/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8207/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8208/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8210/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8211/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8212/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8213/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8214/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8216/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-8217/xxx-xxx | UPDATE B: Available in Q1 2024 | ### Ethernet Controller 4th Generation Family – UPDATE B | Ord. No. | Firmware | |-----------------------|----------------------------------| | 750-823 | UPDATE B: Available in Q1 2024 | | 750-332 | UPDATE B: Available in Q1 2024 | | 750-832/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-862 | UPDATE B: Available in Q1 2024 | | 750-890/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-891 | UPDATE B: Available in Q1 2024 | | 750-893 | UPDATE B: Available in Q1 2024 | ### Ethernet Controller 3rd Generation Family – UPDATE B | Ord. No. | Firmware | |-----------------------|----------------------------------| | 750-331 | UPDATE B: Available in Q1 2024 | | 750-829 | UPDATE B: Available in Q1 2024 | | 750-831/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-852 | UPDATE B: Available in Q1 2024 | | 750-880/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-881 | UPDATE B: Available in Q1 2024 | | 750-882 | UPDATE B: Available in Q1 2024 | | 750-885/xxx-xxx | UPDATE B: Available in Q1 2024 | | 750-889 | UPDATE B: Available in Q1 2024 | ### Engineering Software | Name | Firmware | |------------------|----------------------------------| | WAGO-I/O-PRO 32 | UPDATE B: Available in Q1 2024 |

  • MitigationCODESYS provided by Festo all versionsfesto_psirt

    Enable password protection at login in case no password is set at the controller. Please note that the password configuration file is not covered by the default FFT backup and restore mechanism. You must select the related file manually.

  • Mitigationwago_psirt

    For vulnerabilities CVE-2022-1965, CVE-2022-32136, CVE-2022-32137, CVE-2022-32138, CVE-2022-32139, CVE-2022-32140, CVE-2022-32141, CVE-2022-32142, CVE-2022-32143 (CODESYS Advisory 2022-11): - Activation of online user management, to prevent unallowed actions from unauthorized attackers - Setting strong passwords - Use e!Runtime or CODESYS V3 For vulnerabilities CVE-2022-31805, CVE-2022-31806 (CODESYS Advisory 2022-12): - Activation of online user management, to prevent unallowed actions from unauthorized attackers - Use encryption of online communication whenever possible, this protects password transmission.

  • MitigationCODESYS provided by Festo all versionscisa_csaf_ot

    Enable password protection at login in case no password is set at the controller. Please note that the password configuration file is not covered by the default FFT backup and restore mechanism. You must select the related file manually.

02

cvss

Technical severity, 0–10. One row per scoring source.

5.3
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9
v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Psecondary · CISA US
v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Psecondary · Festo PSIRT DE
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · info@cert.vde.comexploitability 3.9 · impact 1.4
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · WAGO PSIRT DE
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · Festo PSIRT DE
v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · CISA US
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400USCWE-400USCWE-400US
04

affected products (36)

Products and version ranges known to be affected.

showing 20 of 36
05

advisories (3)

Vendor and ecosystem advisories describing this.

  • FSA-202406Several Codesys Gateway v2 vulnerabilities in Codesys provided by Festo2024-12-03csaf · festo_psirtDE

    An unauthenticated attacker would be able to send crafted requests to cause the CODESYS Gateway Server V2 to allocate excessive memory or consume all available TCP client connections. Besides, passwords are insufficiently checked during login. All versions of the following CODESYS V2 product prior version V2.3.9.38 are affected: • CODESYS Gateway Server

  • VDE-2022-040WAGO: Multiple Vulnerabilities in Controller with WAGO I/O-Pro / CODESYS 2.3 Runtime2022-10-17csaf · wago_psirtDE

    UPDATE A: Solution has updated release datesUPDATE B: Solution has updated release datesThis Advisory is published with reference to: CODESYS Advisory 2022-11 (Security update for CODESYS Control V2) CODESYS Advisory 2022-12 (Security update for CODESYS V2 password transport) CODESYS Advisory 2022-13 (Security update for CODESYS Gateway V2)

  • ICSA-25-182-03FESTO CODESYS2024-12-03icsa · cisa_csaf_otUS

    An unauthenticated attacker would be able to send crafted requests to cause the CODESYS Gateway Server V2 to allocate excessive memory or consume all available TCP client connections. Besides, passwords are insufficiently checked during login. All versions of the following CODESYS V2 product prior version V2.3.9.38 are affected: • CODESYS Gateway Server

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otfesto_psirtnvdwago_psirtNVDCVE.orgMITRE
published 2022-06-24modified 2026-06-17
08

references (5)

External citations — patches, advisories, analysis.

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