CVE-2021-43542 — Information Exposure via Error Message in Mozilla Firefox

CWE-209 — Information Exposure via Error Message16 documents8 sources
Severity
6.5MEDIUMNVD
OSV8.8
EPSS
0.7%
top 28.95%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+1 more
Timeline
PublishedDec 8
Latest updateJan 21

Description

Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NExploitability: 2.8 | Impact: 3.6

Affected Packages9 packages

▶CVEListV5mozilla/firefoxunspecified — 95
▶NVDmozilla/firefox< 95.0
▶CVEListV5mozilla/firefox_esrunspecified — 91.4.0
▶NVDmozilla/firefox_esr< 91.4.0
▶Ubuntumozilla/firefox< 95.0.1+build2-0ubuntu0.18.04.1+3

Also affects: Debian Linux 10.0, 11.0, 9.0

🔴Vulnerability Details

6
OSV
thunderbird vulnerabilities↗2022-01-21
▶
OSV
firefox regressions↗2021-12-20
▶
GHSA
GHSA-2jvx-947v-x43p: Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols↗2021-12-09
▶
OSV
firefox vulnerabilities↗2021-12-09
▶
OSV
CVE-2021-43542: Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols↗2021-12-08
▶

📋Vendor Advisories

9
Ubuntu
Thunderbird vulnerabilities↗2022-01-21
▶
Ubuntu
Thunderbird vulnerabilities↗2022-01-21
▶
Ubuntu
Firefox regressions↗2021-12-20
▶
Ubuntu
Firefox vulnerabilities↗2021-12-09
▶
Red Hat
Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler↗2021-12-07
▶
CVE-2021-43542 — Information Exposure via Error Message | cvebase