Search for vulnerabilities
Vulnerability details: VCID-62jv-mdru-aaaa
Vulnerability ID VCID-62jv-mdru-aaaa
Aliases CVE-2021-23986
Summary A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-346 Origin Validation Error
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23986.html
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epss 0.00146 https://api.first.org/data/v1/epss?cve=CVE-2021-23986
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generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23986
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-23986
cvssv3 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-23986
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-23986
archlinux High https://security.archlinux.org/AVG-1728
generic_textual Medium https://ubuntu.com/security/notices/USN-4893-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-10
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/#CVE-2021-23986
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23986.html
https://api.first.org/data/v1/epss?cve=CVE-2021-23986
https://bugzilla.mozilla.org/show_bug.cgi?id=1692623
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23986
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://ubuntu.com/security/notices/USN-4893-1
https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/#CVE-2021-23986
https://www.mozilla.org/security/advisories/mfsa2021-10/
AVG-1728 https://security.archlinux.org/AVG-1728
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
CVE-2021-23986 https://nvd.nist.gov/vuln/detail/CVE-2021-23986
mfsa2021-10 https://www.mozilla.org/en-US/security/advisories/mfsa2021-10
USN-4893-1 https://usn.ubuntu.com/4893-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23986
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:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23986
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:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23986
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 0.13489
EPSS Score 0.00053
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.