Ktor
CVE-2023-34339
LOW
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Error message sanitization
MITRE ATT&CK
1 technique across 1 tactic: Discovery The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 3.3 (LOW). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required. |
| Exploit ScenarioDerived | Successful exploitation could compromise the low-severity affected system. |
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Alert meAnalysisAI
In JetBrains Ktor before 2.3.1 headers containing authentication data could be added to the exception's message. Rated low severity (CVSS 3.3), this vulnerability is low attack complexity.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified under CWE-209. In JetBrains Ktor before 2.3.1 headers containing authentication data could be added to the exception's message Affected products include: Jetbrains Ktor. Version information: before 2.3.1.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
In JetBrains Ktor before 2.3.1 headers containing authentication data could be added to the exception's message
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)NVD
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location. Rated medium s
In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE. Rated
JetBrains Ktor framework before 1.2.0-rc does not sanitize the username provided by the user for the LDAP protocol, lead
JetBrains Ktor framework before version 1.2.6 was vulnerable to HTTP Response Splitting. Rated medium severity (CVSS 5.4
In JetBrains Ktor before 2.3.5 server certificates were not verified. Rated critical severity (CVSS 9.1), this vulnerabi
JetBrains Ktor framework (created using the Kotlin IDE template) versions before 1.1.0 were resolving artifacts using an
In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly. R
In Ktor before 1.3.0, request smuggling is possible when running behind a proxy that doesn't handle Content-Length and T
In JetBrains Ktor before 2.1.0 the wrong authentication provider could be selected in some cases. Rated medium severity
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible. Rated medium severity (CVSS 6.5), this vulnerabilit
JetBrains Ktor before 2.1.0 was vulnerable to the Reflect File Download attack. Rated medium severity (CVSS 6.1), this v
In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible. Rated medium severity (CVSS 5.3), this vulnerabil
GitHub PoC
Exploit-DB