High severity · published Nov 9, 2021
CVE-2021-43203
In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly
7.5
CVSS
0.9%
EPSS
No
On KEV
Description
In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KT
Ktor · Jetbrains
before 1.6.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43203
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-43203
Vendor Advisory
https://blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021/
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