CVE-2026-40434: Anviz CrossChex Standard lacks source verification in the client/server channel, enabling TCP packet injectio

Routine

HIGH 8.1MITIGATE

CVE-2026-40434 is a high-severity flaw (CVSS 8.1) affecting crosschex standard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.1 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-940
Published	2026-04-17
Last modified	2026-10-26

Publisher (CNA): ICS-CERT · Vendor: anviz

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-17 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

anviz crosschex standard MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy crosschex-standard || rpm -q crosschex-standard || crosschex-standard --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40434?

crosschex standard: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-40434 being exploited?

CVE-2026-40434 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40434 affect?

CVE-2026-40434 affects crosschex standard. Severity is high (CVSS 8.1). 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.

How urgent is CVE-2026-40434?

Priority 32/100. High severity

Related CVEs

CVE-2026-32650 HIGH 7.5 MITIGATE Anviz CrossChex Standard is vulnerable when an attacker manipulates the TDS7 PreLogin to disable encryption,

References

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