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Fencer Vulns
high 8.1

CVE-2026-40434 json

Anviz CrossChex Standard Improper Verification of Source of a Communication Channel

published 2026-04-17 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-23533

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-26-106-03 updated cvss 8.1

Anviz Multiple Products

  • Anviz CrossChex Standard
    affected: mitigation “Anviz did not respond to CISA's attempts to coordinate these vulnerabilities. Users should contact Anviz for more information at https://www.anviz.com/contact-us.html.” anviz.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

  • Anviz Anviz CrossChex Standard

Classification

Weakness
  • CWE-940 Improper Verification of Source of a Communication Channel

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.