CVE-2021-21419

2021-05-0700:00:00

ubuntu.com

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.001 Low

EPSS

Percentile

46.4%

JSON

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.

Bugs

<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988342>

Notes

Author	Note
leosilva	support for permessage-defalte extension or compression extension was added by b7d2a251ad55e1c161aa6c8aa236db456c4c4a21 and it’s not present in versions of Bionic and xenial/esm-infra.

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchpython-eventlet< 0.25.1-2ubuntu1.1UNKNOWN
ubuntu20.10noarchpython-eventlet< 0.26.1-0ubuntu1.1UNKNOWN
ubuntu21.04noarchpython-eventlet< 0.30.0-0ubuntu1.1UNKNOWN
ubuntu21.10noarchpython-eventlet< 0.30.0-0ubuntu2UNKNOWN
ubuntu22.04noarchpython-eventlet< 0.30.0-0ubuntu2UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	python-eventlet	< 0.25.1-2ubuntu1.1	UNKNOWN
ubuntu	20.10	noarch	python-eventlet	< 0.26.1-0ubuntu1.1	UNKNOWN
ubuntu	21.04	noarch	python-eventlet	< 0.30.0-0ubuntu1.1	UNKNOWN
ubuntu	21.10	noarch	python-eventlet	< 0.30.0-0ubuntu2	UNKNOWN
ubuntu	22.04	noarch	python-eventlet	< 0.30.0-0ubuntu2	UNKNOWN