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CVE-2021-23975

Published: 26 February 2021

The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Low

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic
Released (86.0+build3-0ubuntu0.18.04.1)
focal
Released (86.0+build3-0ubuntu0.20.04.1)
groovy
Released (86.0+build3-0ubuntu0.20.10.1)
hirsute
Released (86.0+build3-0ubuntu1)
impish
Released (86.0+build3-0ubuntu1)
jammy
Released (86.0+build3-0ubuntu1)
lunar
Released (86.0+build3-0ubuntu1)
trusty Does not exist

upstream
Released (86)
xenial
Released (86.0+build3-0ubuntu0.16.04.1)
kinetic
Released (86.0+build3-0ubuntu1)
mantic
Released (86.0+build3-0ubuntu1)
mozjs38
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

kinetic Does not exist

mantic Does not exist

mozjs52
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
impish Does not exist

jammy Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

bionic Needs triage

focal Needs triage

hirsute Does not exist

xenial Does not exist

kinetic Does not exist

mantic Does not exist

mozjs60
Launchpad, Ubuntu, Debian
impish Does not exist

jammy Does not exist

lunar Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

kinetic Does not exist

mantic Does not exist

mozjs68
Launchpad, Ubuntu, Debian
focal Needs triage

groovy Ignored
(end of life)
hirsute Does not exist

impish Does not exist

jammy Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

bionic Does not exist

kinetic Does not exist

mantic Does not exist

mozjs78
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
jammy Needs triage

trusty Does not exist

upstream Needs triage

xenial Does not exist

impish Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
mantic Does not exist

lunar Ignored
(end of life, was needs-triage)

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 High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N