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Vulnerability details: VCID-p935-2hns-aaah
Vulnerability ID VCID-p935-2hns-aaah
Aliases CVE-2021-29970
Summary A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-416 Use After Free
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-29970.html
rhas Important https://access.redhat.com/errata/RHSA-2021:2740
rhas Important https://access.redhat.com/errata/RHSA-2021:2741
rhas Important https://access.redhat.com/errata/RHSA-2021:2742
rhas Important https://access.redhat.com/errata/RHSA-2021:2743
rhas Important https://access.redhat.com/errata/RHSA-2021:2881
rhas Important https://access.redhat.com/errata/RHSA-2021:2882
rhas Important https://access.redhat.com/errata/RHSA-2021:2883
rhas Important https://access.redhat.com/errata/RHSA-2021:2914
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29970.json
epss 0.00247 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
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epss 0.00247 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00652 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00812 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00812 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00812 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00812 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00812 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
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epss 0.00812 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00979 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00979 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.00979 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.01389 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.01389 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.01389 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
epss 0.01389 https://api.first.org/data/v1/epss?cve=CVE-2021-29970
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1982013
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29969
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29970
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29976
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30547
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.1 https://nvd.nist.gov/vuln/detail/CVE-2021-29970
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29970
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29970
archlinux High https://security.archlinux.org/AVG-2148
archlinux High https://security.archlinux.org/AVG-2152
cvssv3.1 7.5 https://security.gentoo.org/glsa/202208-14
generic_textual HIGH https://security.gentoo.org/glsa/202208-14
generic_textual Medium https://ubuntu.com/security/notices/USN-5011-1
generic_textual Medium https://ubuntu.com/security/notices/USN-5058-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-28
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/#CVE-2021-29970
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-29
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-29/#CVE-2021-29970
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-30
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/#CVE-2021-29970
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-29970.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29970.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29970
https://bugzilla.mozilla.org/show_bug.cgi?id=1709976
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29969
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29970
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29976
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30547
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/202202-03
https://security.gentoo.org/glsa/202208-14
https://ubuntu.com/security/notices/USN-5011-1
https://ubuntu.com/security/notices/USN-5058-1
https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/#CVE-2021-29970
https://www.mozilla.org/en-US/security/advisories/mfsa2021-29/#CVE-2021-29970
https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/#CVE-2021-29970
https://www.mozilla.org/security/advisories/mfsa2021-28/
https://www.mozilla.org/security/advisories/mfsa2021-29/
https://www.mozilla.org/security/advisories/mfsa2021-30/
1982013 https://bugzilla.redhat.com/show_bug.cgi?id=1982013
ASA-202107-20 https://security.archlinux.org/ASA-202107-20
ASA-202107-21 https://security.archlinux.org/ASA-202107-21
AVG-2148 https://security.archlinux.org/AVG-2148
AVG-2152 https://security.archlinux.org/AVG-2152
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:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2021-29970 https://nvd.nist.gov/vuln/detail/CVE-2021-29970
mfsa2021-28 https://www.mozilla.org/en-US/security/advisories/mfsa2021-28
mfsa2021-29 https://www.mozilla.org/en-US/security/advisories/mfsa2021-29
mfsa2021-30 https://www.mozilla.org/en-US/security/advisories/mfsa2021-30
RHSA-2021:2740 https://access.redhat.com/errata/RHSA-2021:2740
RHSA-2021:2741 https://access.redhat.com/errata/RHSA-2021:2741
RHSA-2021:2742 https://access.redhat.com/errata/RHSA-2021:2742
RHSA-2021:2743 https://access.redhat.com/errata/RHSA-2021:2743
RHSA-2021:2881 https://access.redhat.com/errata/RHSA-2021:2881
RHSA-2021:2882 https://access.redhat.com/errata/RHSA-2021:2882
RHSA-2021:2883 https://access.redhat.com/errata/RHSA-2021:2883
RHSA-2021:2914 https://access.redhat.com/errata/RHSA-2021:2914
USN-5011-1 https://usn.ubuntu.com/5011-1/
USN-5058-1 https://usn.ubuntu.com/5058-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29970.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:U/C:H/I:H/A:H 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:H/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29970
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:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29970
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:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29970
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:N/S:U/C:N/I:N/A:H Found at https://security.gentoo.org/glsa/202208-14
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 0.45218
EPSS Score 0.00247
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.