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Vulnerability details: VCID-uwbt-ejee-aaan
Vulnerability ID VCID-uwbt-ejee-aaan
Aliases CVE-2021-29986
Summary A suspected race condition when calling getaddrinfo led to memory corruption and a potentially exploitable crash. *Note: This issue only affected Linux operating systems. Other operating systems are unaffected.* 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-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-29986.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 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29986.json
epss 0.00131 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
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epss 0.00179 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
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epss 0.00179 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
epss 0.01685 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
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epss 0.01685 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
epss 0.03391 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
epss 0.03391 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
epss 0.03391 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
epss 0.03391 https://api.first.org/data/v1/epss?cve=CVE-2021-29986
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1992417
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-2021-29986
cvssv3 8.1 https://nvd.nist.gov/vuln/detail/CVE-2021-29986
cvssv3.1 8.1 https://nvd.nist.gov/vuln/detail/CVE-2021-29986
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-2021-29986
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-2021-29986
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-2021-29986.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29986.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29986
https://bugzilla.mozilla.org/show_bug.cgi?id=1696138
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-2021-29986
https://www.mozilla.org/en-US/security/advisories/mfsa2021-34/#CVE-2021-29986
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/
1992417 https://bugzilla.redhat.com/show_bug.cgi?id=1992417
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
CVE-2021-29986 https://nvd.nist.gov/vuln/detail/CVE-2021-29986
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:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29986.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-2021-29986
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:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29986
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:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29986
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 0.29526
EPSS Score 0.00131
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.