Resource exhaustion in Eventlet
CVE-2021-21419
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.018 (77.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: -0.000
Affected products
- Eventlet — versions >= 0.10, < 0.31.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
References
- github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2 (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2021-21419?
- CVE-2021-21419 is a medium-severity vulnerability in Eventlet, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2021-05-07.
- How severe is CVE-2021-21419?
- Medium severity. CVSS v3 base score is 5.3 out of 10.