CVE-2022-31802Network attack vector

Authentication bypass via partial password comparison

Published Jun 24, 2022 · Updated Sep 17, 2024

Authentication bypass in CODESYS Gateway Server V2 before 2.3.9.38 allows remote attackers to log in with a password prefix. During login, the server compares only the supplied prefix with the corresponding part of the configured password and accepts a shorter match. Network reachability to the Gateway service is sufficient, and successful authentication grants the access assigned to the targeted account.

CVSS severity9.8
Critical
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in CODESYS Gateway Server V2 before 2.3.9.38 allows remote attackers to log in with a password prefix. During login, the server compares only the supplied prefix with the corresponding part of the configured password and accepts a shorter match. Network reachability to the Gateway service is sufficient, and successful authentication grants the access assigned to the targeted account.

The record

CVE
CVE-2022-31802
Published
Jun 24, 2022
Updated
Sep 17, 2024
Vendor
CODESYS GmbH
Product
CODESYS Gateway Server V2
Classifications
CWE-187, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=V2 <V2.3.9.38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CODESYS GmbH · CODESYS Gateway Server V2version=V2 <V2.3.9.38

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8CODESYS GmbHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-187Partial String Comparison
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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