What is CVE-2025-35435?

CVE-2025-35435 is a medium-severity vulnerability in Cisa Thorium, classified under Divide By Zero. CVSS score: 4.3/10. Published 2025-09-17.

How severe is CVE-2025-35435?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Cisa Thorium

CVE-2025-35435

CISA Thorium accepts a stream split size of zero then divides by this value. A remote, authenticated attacker could cause the service to crash. Fixed in commit 89101a6.

Published 2025-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Cisa Thorium — versions 1.0.0, 89101a6

Weakness classification (CWE)

CWE-369 — Divide By Zero

References

9119a7d8-5eab-497f-8521-727c672e3725 (Product)
9119a7d8-5eab-497f-8521-727c672e3725 (Third Party Advisory)
9119a7d8-5eab-497f-8521-727c672e3725 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-35435?: CVE-2025-35435 is a medium-severity vulnerability in Cisa Thorium, classified under Divide By Zero. CVSS score: 4.3/10. Published 2025-09-17.
How severe is CVE-2025-35435?: Medium severity. CVSS v3 base score is 4.3 out of 10.