CVE-2021-21419

medium

Published 2021-05-07 · Modified 2023-11-08

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v4 NEW

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not yet in upstream

VIR risk

5.5

Description

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.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
arch		fixed	`0.31.0-1`
sles		affected
debian	bookworm	fixed	`0.26.1-7`
debian	bullseye	fixed	`0.26.1-7`
debian	forky	fixed	`0.26.1-7`
debian	sid	fixed	`0.26.1-7`
debian	trixie	fixed	`0.26.1-7`

Package impact

Ecosystem	Package	Vulnerable	Fixed
PyPI	eventlet	`>=0.10,<0.31.0`	`0.31.0`
PyPI	eventlet	`>=0.10.0,<0.31.0`	`0.31.0`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.