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Vulnerability details: VCID-tyq3-9fh9-aaar
Vulnerability ID VCID-tyq3-9fh9-aaar
Aliases CVE-2021-23961
Summary Further techniques that built on the slipstream research combined with a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine. This vulnerability affects Firefox < 85.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23961.html
rhas Important https://access.redhat.com/errata/RHSA-2021:1350
rhas Important https://access.redhat.com/errata/RHSA-2021:1351
rhas Important https://access.redhat.com/errata/RHSA-2021:1352
rhas Important https://access.redhat.com/errata/RHSA-2021:1353
rhas Important https://access.redhat.com/errata/RHSA-2021:1360
rhas Important https://access.redhat.com/errata/RHSA-2021:1361
rhas Important https://access.redhat.com/errata/RHSA-2021:1362
rhas Important https://access.redhat.com/errata/RHSA-2021:1363
cvssv3 7.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23961.json
epss 0.00417 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
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epss 0.00637 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
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epss 0.00637 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
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epss 0.00637 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00639 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00639 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
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epss 0.00639 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
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epss 0.00857 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.01245 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.01245 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.01245 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.01245 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
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epss 0.01245 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.01245 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
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epss 0.01245 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
epss 0.01507 https://api.first.org/data/v1/epss?cve=CVE-2021-23961
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=1951367
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23961
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23991
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23992
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23993
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23994
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23995
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23998
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23999
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-24002
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29945
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29946
generic_textual Low https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29948
generic_textual Low https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29949
cvssv3.1 7.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-23961
cvssv3 7.4 https://nvd.nist.gov/vuln/detail/CVE-2021-23961
cvssv3.1 7.4 https://nvd.nist.gov/vuln/detail/CVE-2021-23961
archlinux High https://security.archlinux.org/AVG-1492
archlinux High https://security.archlinux.org/AVG-1836
generic_textual Medium https://ubuntu.com/security/notices/USN-4717-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4995-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4995-2
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-03
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23961
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-14
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-15
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23961.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23961.json
https://api.first.org/data/v1/epss?cve=CVE-2021-23961
https://bugzilla.mozilla.org/show_bug.cgi?id=1677940
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23961
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23991
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23992
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23993
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23994
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23995
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23998
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23999
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-24002
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29945
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29946
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29948
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29949
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2021/04/msg00019.html
https://lists.debian.org/debian-lts-announce/2021/04/msg00020.html
https://security.gentoo.org/glsa/202104-09
https://security.gentoo.org/glsa/202104-10
https://ubuntu.com/security/notices/USN-4717-1
https://ubuntu.com/security/notices/USN-4995-1
https://ubuntu.com/security/notices/USN-4995-2
https://www.debian.org/security/2021/dsa-4895
https://www.debian.org/security/2021/dsa-4897
https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23961
https://www.mozilla.org/security/advisories/mfsa2021-03/
1951367 https://bugzilla.redhat.com/show_bug.cgi?id=1951367
ASA-202102-1 https://security.archlinux.org/ASA-202102-1
ASA-202104-4 https://security.archlinux.org/ASA-202104-4
AVG-1492 https://security.archlinux.org/AVG-1492
AVG-1836 https://security.archlinux.org/AVG-1836
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:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2021-23961 https://nvd.nist.gov/vuln/detail/CVE-2021-23961
GLSA-202102-01 https://security.gentoo.org/glsa/202102-01
mfsa2021-03 https://www.mozilla.org/en-US/security/advisories/mfsa2021-03
mfsa2021-14 https://www.mozilla.org/en-US/security/advisories/mfsa2021-14
mfsa2021-15 https://www.mozilla.org/en-US/security/advisories/mfsa2021-15
RHSA-2021:1350 https://access.redhat.com/errata/RHSA-2021:1350
RHSA-2021:1351 https://access.redhat.com/errata/RHSA-2021:1351
RHSA-2021:1352 https://access.redhat.com/errata/RHSA-2021:1352
RHSA-2021:1353 https://access.redhat.com/errata/RHSA-2021:1353
RHSA-2021:1360 https://access.redhat.com/errata/RHSA-2021:1360
RHSA-2021:1361 https://access.redhat.com/errata/RHSA-2021:1361
RHSA-2021:1362 https://access.redhat.com/errata/RHSA-2021:1362
RHSA-2021:1363 https://access.redhat.com/errata/RHSA-2021:1363
USN-4717-1 https://usn.ubuntu.com/4717-1/
USN-4995-1 https://usn.ubuntu.com/4995-1/
USN-4995-2 https://usn.ubuntu.com/4995-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23961.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: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-2021-23961
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:C/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23961
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:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23961
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 0.60899
EPSS Score 0.00417
Published At June 12, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.