Ktor
CVE-2021-43203
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
1DescriptionNVD
In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.
AnalysisAI
In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Technical ContextAI
This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly. Affected products include: Jetbrains Ktor. Version information: before 1.6.4.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.
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 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
In JetBrains Ktor before 2.3.13 improper caching in HttpCache Plugin could lead to response information disclosure. Rate
Same weakness CWE-287 – Improper Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today