CVE-2026-40434

HIGH

Published Apr 17, 2026 Modified May 4, 2026 CWE-940

Description

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.

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CVSS v3.1 Score

8.1

HIGH

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

EPSS — Exploit Prediction

0.0002

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-940 CWE-940

Affected Products

Vendor	Product	Versions
anviz	crosschex_standard	All

References

Other References

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-106-03.json https://www.anviz.com/contact-us.html https://www.cisa.gov/news-events/ics-advisories/icsa-26-106-03

Frequently Asked Questions

What is CVE-2026-40434? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-40434? +

CVE-2026-40434 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0002, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40434? +

CVE-2026-40434 affects products from anviz, specifically: crosschex_standard. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40434? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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