Critical severity · published Nov 4, 2021
CVE-2021-21691
Creating symbolic links is possible without the 'symlink' agent-to-controller access control permission in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier
9.8
CVSS
2.1%
EPSS
No
On KEV
Description
Creating symbolic links is possible without the 'symlink' agent-to-controller access control permission in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.1% · higher than 82% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JE
Jenkins · Jenkins
before 2.303.3; before 2.319 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21691
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-21691
Vendor Advisory
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
More from Jenkins
9.9
CVE-2019-1003029
Jenkins Script Security Plugin Sandbox Bypass Vulnerability
9.9
CVE-2019-1003030
Jenkins Matrix Project Plugin Remote Code Execution Vulnerability
9.8
CVE-2024-23897
Jenkins Command Line Interface (CLI) Path Traversal Vulnerability
9.8
CVE-2018-1000861
A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in…
9.8
CVE-2017-1000353
Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an unauthenticated remote code execution