CVE-2021-25763
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
- Record
CVE-2021-25763- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-327
- Updated
- 2026-11-02
CVE List No score
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
- Record
CVE-2021-25763- Updated
- 2026-11-02
EUVDEUVD-2021-12646 No score
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
- Record
EUVD-2021-12646- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7m4m-xwpv-qmvh No score
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
- Record
GHSA-7m4m-xwpv-qmvh- Weakness
- CWE-327
- Updated
- 2026-11-02
OSV
In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
- Record
CVE-2021-25763- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-25763 is a medium vulnerability (CVSS 5.3) in Jetbrains Ktor, published February 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. No source names a fixed version.