CVE-2021-21419Medium· 5.3▾ SunlitImproper Handling of Highly Compressed Data (Data Amplification) and Memory Allocation with Excessive Size Value in eventlet
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.4 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
1.8%
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.
Version 0.31.0 restricts websocket frame to reasonable limits.
Restricting memory usage via OS limits would help against overall machine exhaustion. No workaround to protect Eventlet process.
If you have any questions or comments about this advisory:
eventlet >= 0.10, < 0.31.0Upgrade to a patched release:
eventlet 0.31.0Connected by shared product, vendor, weakness, or advisory.