CVE-2021-43542
Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
Usando XMLHttpRequest, un atacante podría haber identificado aplicaciones instaladas sondeando los mensajes de error para cargar protocolos externos. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 91.4.0, Firefox ESR versiones anteriores a 91.4.0 y Firefox versiones anteriores a 95
Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, trick a user into accepting unwanted permissions, conduct header splitting attacks, conduct spoofing attacks, bypass security restrictions, confuse the user, or execute arbitrary code.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2021-11-08 CVE Reserved
- 2021-12-08 CVE Published
- 2024-08-04 CVE Updated
- 2025-04-10 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-209: Generation of Error Message Containing Sensitive Information
CAPEC
References (11)
| URL | Tag | Source |
|---|---|---|
| https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html | Mailing List |
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| https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html | Mailing List |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://security.gentoo.org/glsa/202202-03 | 2022-12-09 | |
| https://security.gentoo.org/glsa/202208-14 | 2022-12-09 | |
| https://www.debian.org/security/2021/dsa-5026 | 2022-12-09 | |
| https://www.debian.org/security/2022/dsa-5034 | 2022-12-09 | |
| https://www.mozilla.org/security/advisories/mfsa2021-52 | 2022-12-09 | |
| https://www.mozilla.org/security/advisories/mfsa2021-53 | 2022-12-09 | |
| https://www.mozilla.org/security/advisories/mfsa2021-54 | 2022-12-09 | |
| https://access.redhat.com/security/cve/CVE-2021-43542 | 2021-12-09 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2030112 | 2021-12-09 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Mozilla Search vendor "Mozilla" | Firefox Search vendor "Mozilla" for product "Firefox" | < 95.0 Search vendor "Mozilla" for product "Firefox" and version " < 95.0" | - |
Affected
| ||||||
| Mozilla Search vendor "Mozilla" | Firefox Esr Search vendor "Mozilla" for product "Firefox Esr" | < 91.4.0 Search vendor "Mozilla" for product "Firefox Esr" and version " < 91.4.0" | - |
Affected
| ||||||
| Mozilla Search vendor "Mozilla" | Thunderbird Search vendor "Mozilla" for product "Thunderbird" | < 91.4.0 Search vendor "Mozilla" for product "Thunderbird" and version " < 91.4.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0" | - |
Affected
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