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Vulnerability details: VCID-5352-njw5-aaaa
Vulnerability ID VCID-5352-njw5-aaaa
Aliases CVE-2021-38578
Summary Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-124 Buffer Underwrite ('Buffer Underflow')
System Score Found at
cvssv3 7.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38578.json
epss 0.00051 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
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epss 0.00052 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
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epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
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epss 0.00185 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00205 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00205 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00205 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
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epss 0.00205 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00205 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
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epss 0.00205 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00222 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00235 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00235 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00235 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
epss 0.00235 https://api.first.org/data/v1/epss?cve=CVE-2021-38578
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=1960321
cvssv3.1 7.4 https://bugzilla.tianocore.org/show_bug.cgi?id=3387
ssvc Track https://bugzilla.tianocore.org/show_bug.cgi?id=3387
cvssv3.1 7.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-38578
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38578
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38578
cvssv3.1 7.4 https://www.insyde.com/security-pledge/SA-2023024
ssvc Track https://www.insyde.com/security-pledge/SA-2023024
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38578.json
https://api.first.org/data/v1/epss?cve=CVE-2021-38578
https://bugzilla.tianocore.org/show_bug.cgi?id=3387
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38578
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.insyde.com/security-pledge/SA-2023024
1014468 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1014468
1960321 https://bugzilla.redhat.com/show_bug.cgi?id=1960321
cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:insyde:kernel:5.0:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:insyde:kernel:5.1:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:insyde:kernel:5.2:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.3:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:insyde:kernel:5.3:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:insyde:kernel:5.4:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.5:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:insyde:kernel:5.5:*:*:*:*:*:*:*
CVE-2021-38578 https://nvd.nist.gov/vuln/detail/CVE-2021-38578
RHSA-2023:2165 https://access.redhat.com/errata/RHSA-2023:2165
USN-7060-1 https://usn.ubuntu.com/7060-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38578.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:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L Found at https://bugzilla.tianocore.org/show_bug.cgi?id=3387
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: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-04-23T13:13:33Z/ Found at https://bugzilla.tianocore.org/show_bug.cgi?id=3387
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L 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:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38578
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:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38578
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:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38578
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:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L Found at https://www.insyde.com/security-pledge/SA-2023024
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: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-04-23T13:13:33Z/ Found at https://www.insyde.com/security-pledge/SA-2023024
Exploit Prediction Scoring System (EPSS)
Percentile 0.15753
EPSS Score 0.00051
Published At June 7, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.