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Vulnerability details: VCID-ge3f-yxqu-5fe1
Vulnerability ID VCID-ge3f-yxqu-5fe1
Aliases CVE-2021-3516
Summary There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-416 Use After Free
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 7.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3516.json
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
epss 0.00362 https://api.first.org/data/v1/epss?cve=CVE-2021-3516
cvssv3.1 5.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-3516
cvssv3.1 7.8 https://nvd.nist.gov/vuln/detail/CVE-2021-3516
archlinux High https://security.archlinux.org/AVG-1883
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3516.json
https://api.first.org/data/v1/epss?cve=CVE-2021-3516
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3516
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539
https://gitlab.gnome.org/GNOME/libxml2/-/issues/230
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/
https://security.gentoo.org/glsa/202107-05
https://security.netapp.com/advisory/ntap-20210716-0005/
https://www.oracle.com/security-alerts/cpujan2022.html
1954225 https://bugzilla.redhat.com/show_bug.cgi?id=1954225
987739 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987739
AVG-1883 https://security.archlinux.org/AVG-1883
cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_core_services:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:jboss_core_services:-:*:*:*:*:*:*:*
cpe:2.3:a:xmlsoft:xmllint:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:xmlsoft:xmllint:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
CVE-2021-3516 https://nvd.nist.gov/vuln/detail/CVE-2021-3516
RHSA-2021:2569 https://access.redhat.com/errata/RHSA-2021:2569
RHSA-2022:1389 https://access.redhat.com/errata/RHSA-2022:1389
RHSA-2022:1390 https://access.redhat.com/errata/RHSA-2022:1390
USN-4991-1 https://usn.ubuntu.com/4991-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/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-2021-3516.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:N/S:U/C:N/I:N/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-2021-3516
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3516
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 0.5759
EPSS Score 0.00362
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:36:56.471565+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/4991-1/ 37.0.0