CVE-2021-38492
First published: Tue Sep 07 2021(Updated: )
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.
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <91.1 | 91.1 |
| Mozilla Thunderbird | <91.1 | 91.1 |
| Mozilla Firefox ESR | <78.14 | 78.14 |
| Mozilla Thunderbird | <78.14 | 78.14 |
| Mozilla Firefox | <92 | 92 |
| Mozilla Firefox | <92.0 | |
| Mozilla Firefox ESR | <78.14 | |
| Mozilla Firefox ESR | >=91.0<91.1 | |
| Mozilla Thunderbird | <78.14 | |
| Mozilla Thunderbird | >=91.0<91.1 | |
| Microsoft Windows | ||
| All of | ||
| Microsoft Windows | ||
| Any of | ||
| Mozilla Firefox | <92.0 | |
| Mozilla Firefox | >=91.0<91.1 | |
| Mozilla Firefox ESR | <78.14 | |
| Mozilla Thunderbird | <78.14 | |
| Mozilla Thunderbird | >=91.0<91.1 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1721107
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-40/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-38/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-39/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-41/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-42/
- https://security.gentoo.org/glsa/202208-14
- https://www.mozilla.org/security/advisories/mfsa2021-38/
- https://www.mozilla.org/security/advisories/mfsa2021-39/
- https://www.mozilla.org/security/advisories/mfsa2021-40/
- https://www.mozilla.org/security/advisories/mfsa2021-41/
- https://www.mozilla.org/security/advisories/mfsa2021-42/
Parent vulnerabilities
(Appears in the following advisories)
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2021-38492?
CVE-2021-38492 has been classified as a moderate severity vulnerability affecting Firefox on Windows.
How do I fix CVE-2021-38492?
To fix CVE-2021-38492, update Firefox or Thunderbird to version 91.1 or higher.
Who is affected by CVE-2021-38492?
CVE-2021-38492 affects users of Firefox and Thunderbird on Windows operating systems.
Can CVE-2021-38492 be exploited remotely?
Yes, CVE-2021-38492 can potentially be exploited by attackers to execute scripts on unprivileged pages.
Is CVE-2021-38492 applicable to other operating systems?
No, CVE-2021-38492 is specific to Firefox on Windows and does not affect other operating systems.
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