CVE-2021-40839

2021-09-1002:15:07

Debian Security Bug Tracker

security-tracker.debian.org

python

remote attack

vulnerability

rencode package

cpu

memory

typecode decoding

cve-2021-40839

unix

CVSS2

Attack Vector

NETWORK

Attack 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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.004

Percentile

74.7%

JSON

The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.

OSVersionArchitecturePackageVersionFilename
Debian12allpython-rencode< 1.0.6-2python-rencode_1.0.6-2_all.deb
Debian11allpython-rencode<= 1.0.6-1python-rencode_1.0.6-1_all.deb
Debian999allpython-rencode< 1.0.6-2python-rencode_1.0.6-2_all.deb
Debian13allpython-rencode< 1.0.6-2python-rencode_1.0.6-2_all.deb

OS	Version	Architecture	Package	Version	Filename
Debian	12	all	python-rencode	< 1.0.6-2	python-rencode_1.0.6-2_all.deb
Debian	11	all	python-rencode	<= 1.0.6-1	python-rencode_1.0.6-1_all.deb
Debian	999	all	python-rencode	< 1.0.6-2	python-rencode_1.0.6-2_all.deb
Debian	13	all	python-rencode	< 1.0.6-2	python-rencode_1.0.6-2_all.deb