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Vulnerability details: VCID-b4zg-38x9-23dn
Vulnerability ID VCID-b4zg-38x9-23dn
Aliases CVE-2021-21687
GHSA-3q84-vrvx-rfvf
Summary Missing Authorization Jenkins does not check agent-to-controller access to create symbolic links when unarchiving a symbolic link in FilePath#untar.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-862 Missing Authorization
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-59 Improper Link Resolution Before File Access ('Link Following')
System Score Found at
cvssv3 9.0 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21687.json
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2021-21687
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-3q84-vrvx-rfvf
cvssv3.1 9.0 https://github.com/jenkinsci/jenkins
generic_textual CRITICAL https://github.com/jenkinsci/jenkins
cvssv3.1 9.0 https://nvd.nist.gov/vuln/detail/CVE-2021-21687
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2021-21687
archlinux Critical https://security.archlinux.org/AVG-2526
cvssv3.1 9.0 https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
generic_textual CRITICAL https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21687.json
https://api.first.org/data/v1/epss?cve=CVE-2021-21687
https://github.com/jenkinsci/jenkins
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
2020324 https://bugzilla.redhat.com/show_bug.cgi?id=2020324
ASA-202111-1 https://security.archlinux.org/ASA-202111-1
AVG-2526 https://security.archlinux.org/AVG-2526
CVE-2021-21687 https://nvd.nist.gov/vuln/detail/CVE-2021-21687
GHSA-3q84-vrvx-rfvf https://github.com/advisories/GHSA-3q84-vrvx-rfvf
RHSA-2021:4799 https://access.redhat.com/errata/RHSA-2021:4799
RHSA-2021:4801 https://access.redhat.com/errata/RHSA-2021:4801
RHSA-2021:4827 https://access.redhat.com/errata/RHSA-2021:4827
RHSA-2021:4829 https://access.redhat.com/errata/RHSA-2021:4829
RHSA-2021:4833 https://access.redhat.com/errata/RHSA-2021:4833
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21687.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:C/C:H/I:H/A:H Found at https://github.com/jenkinsci/jenkins
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:C/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21687
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:C/C:H/I:H/A:H Found at https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
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 0.50511
EPSS Score 0.00271
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:48:59.972768+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.jenkins-ci.main/jenkins-core/CVE-2021-21687.yml 38.0.0