Vulnerability · Published Dec 8, 2021 · Assigned by mozilla
CVE-2021-43546
Medium 4.3
In plain English
A medium-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)4.3Medium
Exploit odds (30 days)1.5%top 25.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | firefox | 91.4.0-1.el8_5.alma | ALSA-2021:5013 |
| AlmaLinux:8 | thunderbird | 91.4.0-2.el8_5.alma | ALSA-2021:5045 |
| AlmaLinux:8 | thunderbird | 91.4.0-2.el8_5.alma.plus | ALSA-2021:5045 |
| Alpine:v3.20 | firefox | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.21 | firefox | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.22 | firefox | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.23 | firefox | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.20 | firefox-esr | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.21 | firefox-esr | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.22 | firefox-esr | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.23 | firefox-esr | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.21 | librewolf | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.22 | librewolf | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.23 | librewolf | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.24 | librewolf | 95.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.20 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.21 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.22 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Alpine:v3.23 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43546 |
| Debian:12 | firefox-esr | 91.4.0esr-1 | DEBIAN-CVE-2021-43546 |
| Debian:13 | firefox-esr | 91.4.0esr-1 | DEBIAN-CVE-2021-43546 |
| Debian:14 | firefox-esr | 91.4.0esr-1 | DEBIAN-CVE-2021-43546 |
| Debian:12 | thunderbird | 1:91.4.0-1 | DEBIAN-CVE-2021-43546 |
| Debian:13 | thunderbird | 1:91.4.0-1 | DEBIAN-CVE-2021-43546 |
| Debian:14 | thunderbird | 1:91.4.0-1 | DEBIAN-CVE-2021-43546 |
| Rocky Linux:8 | firefox | 0:91.4.0-1.el8_5 | RLSA-2021:5013 |
| Rocky Linux:8 | thunderbird | 0:91.4.0-2.el8_5 | RLSA-2021:5045 |
| Ubuntu:22.04:LTS | firefox | 95.0+build1-0ubuntu1 | UBUNTU-CVE-2021-43546 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-43546 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | unspecified – before 91.4.0 |
| Mozilla | Firefox ESR | unspecified – before 91.4.0 |
| Mozilla | Firefox | unspecified – before 95 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-53/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-54/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-52/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1737751 x_refsource_MISC
- DSA-5026 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20211229 [SECURITY] [DLA 2863-1] firefox-esr security update mailing-list, x_refsource_MLIST
- DSA-5034 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security update mailing-list, x_refsource_MLIST
- GLSA-202202-03 vendor-advisory, x_refsource_GENTOO
- GLSA-202208-14 vendor-advisory, x_refsource_GENTOO