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Vulnerability details: VCID-ruyq-zxzh-nbce
Vulnerability ID VCID-ruyq-zxzh-nbce
Aliases CVE-2021-29945
Summary The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-476 NULL Pointer Dereference
CWE-682 Incorrect Calculation
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29945.json
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
epss 0.00411 https://api.first.org/data/v1/epss?cve=CVE-2021-29945
cvssv3.1 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-29945
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-29945
archlinux Medium https://security.archlinux.org/AVG-1835
archlinux Medium https://security.archlinux.org/AVG-1837
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
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-16
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29945.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29945
https://bugzilla.mozilla.org/show_bug.cgi?id=1700690
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://www.mozilla.org/security/advisories/mfsa2021-14/
https://www.mozilla.org/security/advisories/mfsa2021-15/
https://www.mozilla.org/security/advisories/mfsa2021-16/
1951370 https://bugzilla.redhat.com/show_bug.cgi?id=1951370
AVG-1835 https://security.archlinux.org/AVG-1835
AVG-1837 https://security.archlinux.org/AVG-1837
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:x86:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:x86:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:x86:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:x86:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:x86:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:x86:*
CVE-2021-29945 https://nvd.nist.gov/vuln/detail/CVE-2021-29945
mfsa2021-14 https://www.mozilla.org/en-US/security/advisories/mfsa2021-14
mfsa2021-15 https://www.mozilla.org/en-US/security/advisories/mfsa2021-15
mfsa2021-16 https://www.mozilla.org/en-US/security/advisories/mfsa2021-16
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-4926-1 https://usn.ubuntu.com/4926-1/
USN-4995-1 https://usn.ubuntu.com/4995-1/
USN-4995-2 https://usn.ubuntu.com/4995-2/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29945.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:L/I:L/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:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29945
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:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29945
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 0.60596
EPSS Score 0.00411
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:45.563444+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-15.yml 37.0.0