CVE-2026-40434
CVE-2026-40434 is a high-severity vulnerability in Anviz Crosschex Standard with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-940.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- EPSS exploit prediction: 0% (14th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-23533
- Weakness: CWE-940
- Affected product: Anviz Crosschex Standard
- Published:
- Last modified:
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.
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.
- How severe is CVE-2026-40434?
- CVE-2026-40434 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
- Is CVE-2026-40434 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-40434?
- CVE-2026-40434 affects Anviz Crosschex Standard. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-40434?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-40434 have an EU (EUVD) identifier?
- Yes. CVE-2026-40434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23533.
- When was CVE-2026-40434 published?
- CVE-2026-40434 was published on 2026-04-17 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:anviz:crosschex_standard:-:*:*:*:*:*:*:*
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