Vulnerability-Lookup

CVE-2026-40434 (GCVE-0-2026-40434)

Vulnerability from cvelistv5 – Published: 2026-04-17 19:49 – Updated: 2026-04-17 20:28

Title

Anviz CrossChex Standard Improper Verification of Source of a Communication Channel

Summary

Anviz CrossChex Standard lacks source verification in the client/server channel, enabling TCP packet injection by an attacker on the same network to alter or disrupt application traffic.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-17 20:27 UTC

CWE

CWE-940

Assigner

icscert icscert root

References

3 references

URL	Tags
https://www.anviz.com/contact-us.html
https://www.cisa.gov/news-events/ics-advisories/i…
https://github.com/cisagov/CSAF/blob/develop/csaf…

Impacted products

1 product

Vendor	Product	Version	CPE status
Anviz	Anviz CrossChex Standard	Affected: All versions	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-40434

Vulnerability from fkie_nvd - Published: 2026-04-17 20:16 - Updated: 2026-06-17 10:45

Severity

8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Summary

Anviz CrossChex Standard lacks source verification in the client/server channel, enabling TCP packet injection by an attacker on the same network to alter or disrupt application traffic.

References

URL	Tags
ics-cert@hq.dhs.gov	https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-106-03.json	Third Party Advisory
ics-cert@hq.dhs.gov	https://www.anviz.com/contact-us.html	Product
ics-cert@hq.dhs.gov	https://www.cisa.gov/news-events/ics-advisories/icsa-26-106-03	US Government Resource

Impacted products

	Vendor	Product	Version
	anviz	crosschex_standard	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Anviz CrossChex Standard",
          "vendor": "Anviz",
          "versions": [
            {
              "status": "affected",
              "version": "All versions"
            }
          ]
        }
      ],
      "source": "ics-cert@hq.dhs.gov"
    }
  ],
  "configurations": [
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    }
  ],
  "id": "CVE-2026-40434",
  "lastModified": "2026-06-17T10:45:18.377",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
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          "confidentialityImpact": "NONE",
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          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
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        },
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        "impactScore": 5.2,
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        "type": "Secondary"
      }
    ],
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      ],
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GHSA-QG37-CWRH-945R

Vulnerability from github – Published: 2026-04-17 21:31 – Updated: 2026-04-17 21:31

Details

Anviz CrossChex Standard lacks source verification in the client/server channel, enabling TCP packet injection by an attacker on the same network to alter or disrupt application traffic.

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2026-40434"
  ],
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    "cwe_ids": [
      "CWE-940"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-17T20:16:36Z",
    "severity": "HIGH"
  },
  "details": "Anviz CrossChex Standard\nlacks source verification in the client/server channel, enabling TCP \npacket injection by an attacker on the same network to alter or disrupt \napplication traffic.",
  "id": "GHSA-qg37-cwrh-945r",
  "modified": "2026-04-17T21:31:47Z",
  "published": "2026-04-17T21:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40434"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-106-03.json"
    },
    {
      "type": "WEB",
      "url": "https://www.anviz.com/contact-us.html"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-106-03"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

ICSA-26-106-03

Vulnerability from csaf_cisa - Published: 2026-04-16 06:00 - Updated: 2026-04-16 06:00

Summary

Anviz Multiple Products

Scope

12 vulnerabilities in this advisory, including CVE-2026-40434.

CVE-2026-40434

8.1 (High)


                
                  CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Known affected: 1 product

https://www.anviz.com/contact-us.html

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-40434 (GCVE-0-2026-40434)

FKIE_CVE-2026-40434

GHSA-QG37-CWRH-945R

ICSA-26-106-03

Tags

Sightings

Nomenclature

Related by attack behaviour