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Vulnerability details: VCID-b8ub-22jk-u3g5
Vulnerability ID VCID-b8ub-22jk-u3g5
Aliases CVE-2021-38492
Summary When delegating navigations to the operating system, Thunderbird 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 Thunderbird for Windows. Other operating systems are unaffected.*
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-829 Inclusion of Functionality from Untrusted Control Sphere
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38492.json
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.00438 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.00438 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.00532 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.00532 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.00532 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.00532 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
epss 0.00532 https://api.first.org/data/v1/epss?cve=CVE-2021-38492
cvssv3.1 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-38492
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-38492
archlinux Medium https://security.archlinux.org/AVG-2351
archlinux Medium https://security.archlinux.org/AVG-2353
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-38
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2021-39
generic_textual low https://www.mozilla.org/en-US/security/advisories/mfsa2021-40
generic_textual low https://www.mozilla.org/en-US/security/advisories/mfsa2021-41
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2021-42
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38492.json
https://api.first.org/data/v1/epss?cve=CVE-2021-38492
https://bugzilla.mozilla.org/show_bug.cgi?id=1721107
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/202208-14
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/
2002118 https://bugzilla.redhat.com/show_bug.cgi?id=2002118
AVG-2351 https://security.archlinux.org/AVG-2351
AVG-2353 https://security.archlinux.org/AVG-2353
CVE-2021-38492 https://nvd.nist.gov/vuln/detail/CVE-2021-38492
mfsa2021-38 https://www.mozilla.org/en-US/security/advisories/mfsa2021-38
mfsa2021-39 https://www.mozilla.org/en-US/security/advisories/mfsa2021-39
mfsa2021-40 https://www.mozilla.org/en-US/security/advisories/mfsa2021-40
mfsa2021-41 https://www.mozilla.org/en-US/security/advisories/mfsa2021-41
mfsa2021-42 https://www.mozilla.org/en-US/security/advisories/mfsa2021-42
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38492.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38492
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38492
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.48157
EPSS Score 0.0025
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:47.257552+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-41.yml 37.0.0