Medium severity · published Sep 17, 2025
CVE-2025-35435
CISA Thorium download stream divide by zero
4.3
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TH
Thorium · CISA
1.0.0 before 89101a6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-35435
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-35435
Product
https://github.com/cisagov/thorium/commit/7c94a0b9bc2dc55e0c307360452f348bac06820c
Vendor Advisory
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-259-01.json
Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2025-CVE-2025-35435
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