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CVE-2021-39520

Published: 20 September 2021

An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::PushReconstructedData() located in blockbitmaprequester.cpp. It allows an attacker to cause Denial of Service.

Notes

AuthorNote
jdstrand
libjpeg-turbo is a fork of libjpeg8
mdeslaur
file doesn't exist in libjpeg-turbo
eslerm
libjpeg-turbo/libjpeg6b/libjpeg8/libjpeg9 are from different
codebases
only libjpeg is affected

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
libjpeg
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needs triage

hirsute Not vulnerable
(0.0~git20210129.91985dc-1build1)
impish Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

trusty Does not exist

upstream
Released (0.0~git20200925.f145908-1)
xenial Ignored
(out of standard support)
libjpeg-turbo
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
hirsute Not vulnerable
(code not present)
impish Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
kinetic Not vulnerable
(code not present)
trusty Not vulnerable
(code not present)
upstream Not vulnerable
(code not present)
xenial Not vulnerable
(code not present)
libjpeg6b
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
hirsute Ignored
(reached end-of-life)
impish Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
kinetic Not vulnerable
(code not present)
trusty Not vulnerable
(code not present)
upstream Not vulnerable
(code not present)
xenial Needs triage

libjpeg9
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
hirsute Ignored
(reached end-of-life)
impish Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
kinetic Not vulnerable
(code not present)
trusty Does not exist

upstream Not vulnerable
(code not present)
xenial Not vulnerable
(code)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H