CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2021-21419
Medium (5.3). EPSS 1.8% chance of exploitation in the next 30 days. Fixed in eventlet 0.31.0.
Eventlet is a concurrent networking library for Python. A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.
Severity
- EPSS
- 1.8% chance of exploitation in the next 30 days; higher than 78% of CVEs (scores of 2026-10-31)
- CWE
- CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- eventlet:eventlet
- fedoraproject:fedora
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9p9m-jm8w-94p2 | PyPI | eventlet | >=0.10 <0.31.0 | 0.31.0 |
| PYSEC-2021-12 | PyPI | eventlet | >=0.10.0 <0.31.0 | 0.31.0 |
References
- https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2WJFSBPLCNSZNHYQC4QDRDFRTEZRMD2L/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5JZP4LZOSP7CUAM3GIRW6PIAWKH5VGB/
- https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2WJFSBPLCNSZNHYQC4QDRDFRTEZRMD2L/