Vulnerability in Jetbrains Ktor
CVE-2025-29904
In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Jetbrains Ktor — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.jetbrains.com/privacy-security/issues-fixed/ (Issue Tracking)
Frequently asked questions
- What is CVE-2025-29904?
- CVE-2025-29904 is a medium-severity vulnerability in Jetbrains Ktor, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2025-03-12.
- How severe is CVE-2025-29904?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-29904 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.