Search for vulnerabilities
Vulnerability details: VCID-ta46-hat4-aaah
Vulnerability ID VCID-ta46-hat4-aaah
Aliases CVE-2021-38496
Summary During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-38496.html
rhas Important https://access.redhat.com/errata/RHSA-2021:3755
rhas Important https://access.redhat.com/errata/RHSA-2021:3756
rhas Important https://access.redhat.com/errata/RHSA-2021:3757
rhas Important https://access.redhat.com/errata/RHSA-2021:3791
rhas Important https://access.redhat.com/errata/RHSA-2021:3838
rhas Important https://access.redhat.com/errata/RHSA-2021:3839
rhas Important https://access.redhat.com/errata/RHSA-2021:3840
rhas Important https://access.redhat.com/errata/RHSA-2021:3841
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38496.json
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00258 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.00949 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
epss 0.03397 https://api.first.org/data/v1/epss?cve=CVE-2021-38496
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=2011097
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38496
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38500
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38503
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38504
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38506
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38507
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38508
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38509
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38496
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38496
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38496
archlinux High https://security.archlinux.org/AVG-2443
archlinux High https://security.archlinux.org/AVG-2459
generic_textual Medium https://ubuntu.com/security/notices/USN-5132-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-43
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/#CVE-2021-38496
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-44
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-45
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-47
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-38496.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38496.json
https://api.first.org/data/v1/epss?cve=CVE-2021-38496
https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38496
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38500
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38502
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38503
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38504
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38506
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38507
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38508
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38509
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4126
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4129
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43528
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43529
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43534
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43535
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43536
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43537
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43538
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43539
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43541
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43542
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43543
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43545
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43546
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44538
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
https://ubuntu.com/security/notices/USN-5132-1
https://www.debian.org/security/2022/dsa-5034
https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/#CVE-2021-38496
https://www.mozilla.org/security/advisories/mfsa2021-43/
https://www.mozilla.org/security/advisories/mfsa2021-44/
https://www.mozilla.org/security/advisories/mfsa2021-45/
https://www.mozilla.org/security/advisories/mfsa2021-46/
https://www.mozilla.org/security/advisories/mfsa2021-47/
2011097 https://bugzilla.redhat.com/show_bug.cgi?id=2011097
AVG-2443 https://security.archlinux.org/AVG-2443
AVG-2459 https://security.archlinux.org/AVG-2459
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:*:*:*:*:*:*:*:*
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:11.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
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-2021-38496 https://nvd.nist.gov/vuln/detail/CVE-2021-38496
mfsa2021-43 https://www.mozilla.org/en-US/security/advisories/mfsa2021-43
mfsa2021-44 https://www.mozilla.org/en-US/security/advisories/mfsa2021-44
mfsa2021-45 https://www.mozilla.org/en-US/security/advisories/mfsa2021-45
mfsa2021-47 https://www.mozilla.org/en-US/security/advisories/mfsa2021-47
RHSA-2021:3755 https://access.redhat.com/errata/RHSA-2021:3755
RHSA-2021:3756 https://access.redhat.com/errata/RHSA-2021:3756
RHSA-2021:3757 https://access.redhat.com/errata/RHSA-2021:3757
RHSA-2021:3791 https://access.redhat.com/errata/RHSA-2021:3791
RHSA-2021:3838 https://access.redhat.com/errata/RHSA-2021:3838
RHSA-2021:3839 https://access.redhat.com/errata/RHSA-2021:3839
RHSA-2021:3840 https://access.redhat.com/errata/RHSA-2021:3840
RHSA-2021:3841 https://access.redhat.com/errata/RHSA-2021:3841
USN-5107-1 https://usn.ubuntu.com/5107-1/
USN-5132-1 https://usn.ubuntu.com/5132-1/
USN-5248-1 https://usn.ubuntu.com/5248-1/
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-2021-38496.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: AV:N/AC:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38496
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-2021-38496
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-2021-38496
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 0.65999
EPSS Score 0.00258
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.