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Vulnerability details: VCID-4d5s-zzcw-aaaj
Vulnerability ID VCID-4d5s-zzcw-aaaj
Aliases CVE-2021-29984
Summary Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
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-2021-29984.html
rhas Important https://access.redhat.com/errata/RHSA-2021:3154
rhas Important https://access.redhat.com/errata/RHSA-2021:3155
rhas Important https://access.redhat.com/errata/RHSA-2021:3156
rhas Important https://access.redhat.com/errata/RHSA-2021:3157
rhas Important https://access.redhat.com/errata/RHSA-2021:3159
rhas Important https://access.redhat.com/errata/RHSA-2021:3160
rhas Important https://access.redhat.com/errata/RHSA-2021:3161
rhas Important https://access.redhat.com/errata/RHSA-2021:3162
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29984.json
epss 0.00225 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
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epss 0.00802 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
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epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
epss 0.01267 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
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epss 0.02446 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
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epss 0.02446 https://api.first.org/data/v1/epss?cve=CVE-2021-29984
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1992420
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29980
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29984
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29985
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29986
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29988
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29989
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29984
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29984
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29984
archlinux High https://security.archlinux.org/AVG-2269
archlinux High https://security.archlinux.org/AVG-2270
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-5037-1
generic_textual Medium https://ubuntu.com/security/notices/USN-5058-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-33
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-33/#CVE-2021-29984
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-34
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-34/#CVE-2021-29984
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-35
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-36
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-29984.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29984.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29984
https://bugzilla.mozilla.org/show_bug.cgi?id=1720031
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29980
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29984
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29985
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29986
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29988
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29989
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-5037-1
https://ubuntu.com/security/notices/USN-5058-1
https://www.mozilla.org/en-US/security/advisories/mfsa2021-33/#CVE-2021-29984
https://www.mozilla.org/en-US/security/advisories/mfsa2021-34/#CVE-2021-29984
https://www.mozilla.org/security/advisories/mfsa2021-33/
https://www.mozilla.org/security/advisories/mfsa2021-34/
https://www.mozilla.org/security/advisories/mfsa2021-35/
https://www.mozilla.org/security/advisories/mfsa2021-36/
1992420 https://bugzilla.redhat.com/show_bug.cgi?id=1992420
ASA-202108-14 https://security.archlinux.org/ASA-202108-14
AVG-2269 https://security.archlinux.org/AVG-2269
AVG-2270 https://security.archlinux.org/AVG-2270
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-2021-29984 https://nvd.nist.gov/vuln/detail/CVE-2021-29984
mfsa2021-33 https://www.mozilla.org/en-US/security/advisories/mfsa2021-33
mfsa2021-34 https://www.mozilla.org/en-US/security/advisories/mfsa2021-34
mfsa2021-35 https://www.mozilla.org/en-US/security/advisories/mfsa2021-35
mfsa2021-36 https://www.mozilla.org/en-US/security/advisories/mfsa2021-36
RHSA-2021:3154 https://access.redhat.com/errata/RHSA-2021:3154
RHSA-2021:3155 https://access.redhat.com/errata/RHSA-2021:3155
RHSA-2021:3156 https://access.redhat.com/errata/RHSA-2021:3156
RHSA-2021:3157 https://access.redhat.com/errata/RHSA-2021:3157
RHSA-2021:3159 https://access.redhat.com/errata/RHSA-2021:3159
RHSA-2021:3160 https://access.redhat.com/errata/RHSA-2021:3160
RHSA-2021:3161 https://access.redhat.com/errata/RHSA-2021:3161
RHSA-2021:3162 https://access.redhat.com/errata/RHSA-2021:3162
USN-5037-1 https://usn.ubuntu.com/5037-1/
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-2021-29984.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:H/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:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29984
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-2021-29984
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-2021-29984
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 0.42387
EPSS Score 0.00225
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.