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Vulnerability details: VCID-rsvx-3f49-v3an
Vulnerability ID VCID-rsvx-3f49-v3an
Aliases CVE-2021-3541
Summary Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion) A flaw was found in libxml2. By exploiting an exponential entity expansion attack its possible bypassing all existing protection mechanisms and lead to a denial of service.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
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
CWE-776 Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
CWE-400 Uncontrolled Resource Consumption
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3541.json
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2021-3541
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
archlinux High https://security.archlinux.org/AVG-1883
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3541.json
https://api.first.org/data/v1/epss?cve=CVE-2021-3541
https://bugzilla.redhat.com/show_bug.cgi?id=1950515
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3541
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.netapp.com/advisory/ntap-20210805-0007/
988603 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988603
AVG-1883 https://security.archlinux.org/AVG-1883
CVE-2021-3541 https://nvd.nist.gov/vuln/detail/CVE-2021-3541
GLSA-202107-05 https://security.gentoo.org/glsa/202107-05
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:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3541.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:L/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
Exploit Prediction Scoring System (EPSS)
Percentile 0.18918
EPSS Score 0.0006
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:48:35.092453+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/nokogiri/CVE-2021-3541.yml 38.0.0