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Vulnerability details: VCID-azfr-cppp-eudd
Vulnerability ID VCID-azfr-cppp-eudd
Aliases CVE-2021-3999
Summary multiple issues
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-193 Off-by-one Error
System Score Found at
cvssv3 7.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3999.json
cvssv3.1 7.8 https://access.redhat.com/security/cve/CVE-2021-3999
ssvc Track https://access.redhat.com/security/cve/CVE-2021-3999
epss 0.00848 https://api.first.org/data/v1/epss?cve=CVE-2021-3999
epss 0.00848 https://api.first.org/data/v1/epss?cve=CVE-2021-3999
epss 0.00848 https://api.first.org/data/v1/epss?cve=CVE-2021-3999
epss 0.00848 https://api.first.org/data/v1/epss?cve=CVE-2021-3999
epss 0.00848 https://api.first.org/data/v1/epss?cve=CVE-2021-3999
epss 0.00848 https://api.first.org/data/v1/epss?cve=CVE-2021-3999
cvssv3.1 7.8 https://bugzilla.redhat.com/show_bug.cgi?id=2024637
ssvc Track https://bugzilla.redhat.com/show_bug.cgi?id=2024637
cvssv3.1 7.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 7.8 https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
ssvc Track https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
archlinux High https://security.archlinux.org/AVG-1621
cvssv3.1 7.8 https://security.netapp.com/advisory/ntap-20221104-0001/
ssvc Track https://security.netapp.com/advisory/ntap-20221104-0001/
cvssv3.1 7.8 https://security-tracker.debian.org/tracker/CVE-2021-3999
ssvc Track https://security-tracker.debian.org/tracker/CVE-2021-3999
cvssv3.1 7.8 https://sourceware.org/bugzilla/show_bug.cgi?id=28769
ssvc Track https://sourceware.org/bugzilla/show_bug.cgi?id=28769
cvssv3.1 7.8 https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
ssvc Track https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
cvssv3.1 7.8 https://www.openwall.com/lists/oss-security/2022/01/24/4
ssvc Track https://www.openwall.com/lists/oss-security/2022/01/24/4
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3999.json
https://api.first.org/data/v1/epss?cve=CVE-2021-3999
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3999
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2024637 https://bugzilla.redhat.com/show_bug.cgi?id=2024637
4 https://www.openwall.com/lists/oss-security/2022/01/24/4
AVG-1621 https://security.archlinux.org/AVG-1621
CVE-2021-3999 https://access.redhat.com/security/cve/CVE-2021-3999
CVE-2021-3999 https://security-tracker.debian.org/tracker/CVE-2021-3999
gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
GLSA-202208-24 https://security.gentoo.org/glsa/202208-24
msg00021.html https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
ntap-20221104-0001 https://security.netapp.com/advisory/ntap-20221104-0001/
RHSA-2022:0896 https://access.redhat.com/errata/RHSA-2022:0896
show_bug.cgi?id=28769 https://sourceware.org/bugzilla/show_bug.cgi?id=28769
USN-5310-1 https://usn.ubuntu.com/5310-1/
USN-5310-2 https://usn.ubuntu.com/5310-2/
USN-6762-1 https://usn.ubuntu.com/6762-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3999.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:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/security/cve/CVE-2021-3999
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/2025-12-02T20:54:28Z/ Found at https://access.redhat.com/security/cve/CVE-2021-3999
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://bugzilla.redhat.com/show_bug.cgi?id=2024637
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/2025-12-02T20:54:28Z/ Found at https://bugzilla.redhat.com/show_bug.cgi?id=2024637
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/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: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
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/2025-12-02T20:54:28Z/ Found at https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://security.netapp.com/advisory/ntap-20221104-0001/
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/2025-12-02T20:54:28Z/ Found at https://security.netapp.com/advisory/ntap-20221104-0001/
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://security-tracker.debian.org/tracker/CVE-2021-3999
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/2025-12-02T20:54:28Z/ Found at https://security-tracker.debian.org/tracker/CVE-2021-3999
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://sourceware.org/bugzilla/show_bug.cgi?id=28769
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/2025-12-02T20:54:28Z/ Found at https://sourceware.org/bugzilla/show_bug.cgi?id=28769
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
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/2025-12-02T20:54:28Z/ Found at https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://www.openwall.com/lists/oss-security/2022/01/24/4
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/2025-12-02T20:54:28Z/ Found at https://www.openwall.com/lists/oss-security/2022/01/24/4
Exploit Prediction Scoring System (EPSS)
Percentile 0.75214
EPSS Score 0.00848
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-01T19:57:28.546044+00:00 Arch Linux Importer Import https://security.archlinux.org/AVG-1621 38.6.0