CVE-2026-40434

Traffic alteration via unauthenticated TCP packet injection

Published Apr 17, 2026 · Updated Apr 17, 2026

Source-verification failure in all versions of Anviz CrossChex Standard allows man-in-the-middle attackers to alter traffic via TCP injection. The client/server channel accepts TCP packets without verifying that they originate from the expected peer. Access to the same network is required, and injected packets can modify application traffic or interrupt service; CISA has not disclosed finer protocol details.

CVSS severity8.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Source-verification failure in all versions of Anviz CrossChex Standard allows man-in-the-middle attackers to alter traffic via TCP injection. The client/server channel accepts TCP packets without verifying that they originate from the expected peer. Access to the same network is required, and injected packets can modify application traffic or interrupt service; CISA has not disclosed finer protocol details.

The record

CVE
CVE-2026-40434
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
Anviz
Product
CrossChex Standard
Classifications
CWE-940, T1565.002
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record 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=All versions

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Anviz · CrossChex Standardversion=All versions

Published CVSS scores

8.1ICS-CERTCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-940Improper Verification of Source of a Communication Channel
T1565.002Transmitted Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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