CVE-2021-38492 : When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might allow attackers to

When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. *This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92, Thunderbird < 91.1, Thunderbird < 78.14, Firefox ESR < 78.14, and Firefox ESR < 91.1.

Published 2021-11-03 01:15:07

Updated 2022-12-09 19:19:13

Source Mozilla Corporation

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-38492

Probability of exploitation activity in the next 30 days: 0.22%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 61 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-38492

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: High Availability: None

References for CVE-2021-38492

https://www.mozilla.org/security/advisories/mfsa2021-41/

Security Vulnerabilities fixed in Thunderbird 91.1 — Mozilla
Vendor Advisory

CVEs referencing this url
https://bugzilla.mozilla.org/show_bug.cgi?id=1721107

Access Denied
Exploit;Issue Tracking;Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-40/

Security Vulnerabilities fixed in Firefox ESR 91.1 — Mozilla
Vendor Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-42/

Security Vulnerabilities fixed in Thunderbird 78.14 — Mozilla
Vendor Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/202208-14

Mozilla Thunderbird: Multiple Vulnerabilities (GLSA 202208-14) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-38/

Security Vulnerabilities fixed in Firefox 92 — Mozilla
Vendor Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-39/

Security Vulnerabilities fixed in Firefox ESR 78.14 — Mozilla
Vendor Advisory

CVEs referencing this url

Products affected by CVE-2021-38492

Mozilla » Firefox
Versions before (<) 92.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A
Mozilla » Thunderbird
Versions before (<) 78.14
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A
Mozilla » Thunderbird
Versions from including (>=) 91.0 and before (<) 91.1
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A
Mozilla » Firefox Esr
Versions from including (>=) 91.0 and before (<) 91.1
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A
Mozilla » Firefox Esr
Versions before (<) 78.14
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A

Vulnerability Details : CVE-2021-38492

Exploit prediction scoring system (EPSS) score for CVE-2021-38492

CVSS scores for CVE-2021-38492

References for CVE-2021-38492

Products affected by CVE-2021-38492