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CVE-2021-38508

MEDIUM
4.3
CVSS Score
Published: December 8, 2021 at 09:21 PM UTC
Updated: June 17, 2026 at 04:02 AM UTC
4 products affected across 2 vendorsDebian LinuxFirefoxThunderbird

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Severity
MEDIUM4.3
Exploit prediction
EPSS 2%

Description

By displaying a form validity message in the correct location at the same time as a permission prompt (such as for geolocation), the validity message could have obscured the prompt, resulting in the user potentially being tricked into granting the permission. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.011.09.0
Firefox· Mozilla
95%
v < 94
Affected range stops below 94, so it looks safe — our inference, not a vendor statement
Affected range stops below 94.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 91.3
Affected range stops below 91.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 91.3.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 91.3
Affected range stops below 91.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 91.3.0, so it looks safe — our inference, not a vendor statement

References (10)

x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1366818
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202202-03
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202208-14
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2021/dsa-5026
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2022/dsa-5034
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2021-48/

CVSS

4.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-1021

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