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TI-2021-04771 Aliases CVE-2021-21691GHSA-2c79-h2h5-g3fw

Link following in Jenkins

Priority MEDIUM 46CWE-59Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-863.

Summary

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.

Why it matters now

EPSS 0.02101 81st percentileScored 2026-11-07
Fix Fixed org.jenkins-ci.main:jenkins-core (Maven): 2.303.3, 2.319Red Hat: 6 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
JenkinsJenkinsup to 2.318; up to LTS 2.303.2—No fix listedCNA
—org.jenkins-ci.main:jenkins-core (Maven)before 2.303.32.303.3Patch availableGHSA-2c79-h2h5-g3fw
—org.jenkins-ci.main:jenkins-core (Maven)2.304 to before 2.3192.319Patch availableGHSA-2c79-h2h5-g3fw
  • Jenkins VendorJenkins Affected up to 2.318; up to LTS 2.303.2 Fixed in — No fix listed CNA
  • org.jenkins-ci.main:jenkins-core (Maven) Vendor— Affected before 2.303.3 Fixed in 2.303.3 Patch available GHSA-2c79-h2h5-g3fw
  • org.jenkins-ci.main:jenkins-core (Maven) Vendor— Affected 2.304 to before 2.319 Fixed in 2.319 Patch available GHSA-2c79-h2h5-g3fw

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*before 2.303.3VulnerableJenkins
cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*before 2.319VulnerableJenkins
  • cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:* Versions before 2.303.3 Vulnerable ·Jenkins
  • cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:* Versions before 2.319 Vulnerable ·Jenkins

Remediation

  • Fix · GHSA-2c79-h2h5-g3fw org.jenkins-ci.main:jenkins-core (Maven) Fixed in 2.303.3 Advisory →
  • Fix · GHSA-2c79-h2h5-g3fw org.jenkins-ci.main:jenkins-core (Maven) Fixed in 2.319 Advisory →

Red Hat 6 advisories

  • RHSA-2022:0055 Released 2022-03-10 · Red Hat rating Moderate
    OpenShift Container Platform 4.10.3 bug fix and security update
    • Red Hat OpenShift Container Platform 4.10 coreos-installer-0.12.0-1.rhaos4.10.el8, coreos-installer-bootinfra-0.12.0-1.rhaos4.10.el8, cri-o-1.23.0-92.rhaos4.10.gitdaab4d1.el7 +11
  • RHSA-2021:4827 Released 2021-12-02 · Red Hat rating Important
    OpenShift Container Platform 3.11.569 security update
    • Red Hat OpenShift Container Platform 3.11 jenkins-2-plugins-3.11.1637699107-1.el7, jenkins-2.303.3.1637698110-1.el7
  • RHSA-2021:4799 Released 2021-12-02 · Red Hat rating Important
    OpenShift Container Platform 4.6.51 packages and security update
    • Red Hat OpenShift Container Platform 4.6 jenkins-2-plugins-4.6.1637602169-1.el8, jenkins-2.303.3.1637597493-1.el8
Show 3 more Red Hat advisories
  • RHSA-2021:4801 Released 2021-12-01 · Red Hat rating Important
    OpenShift Container Platform 4.7.38 security update
    • Red Hat OpenShift Container Platform 4.7 jenkins-2-plugins-4.7.1637600997-1.el8, jenkins-2.303.3.1637597018-1.el8
  • RHSA-2021:4829 Released 2021-11-30 · Red Hat rating Important
    OpenShift Container Platform 4.8.22 security update
    • Red Hat OpenShift Container Platform 4.8 coreos-installer-0.9.0-8.rhaos4.8.el8, jenkins-2-plugins-4.8.1637599935-1.el8, jenkins-2.303.3.1637596565-1.el8
  • RHSA-2021:4833 Released 2021-11-29 · Red Hat rating Important
    OpenShift Container Platform 4.9.9 security update
    • Red Hat OpenShift Container Platform 4.9 jenkins-2-plugins-4.9.1637598812-1.el8, jenkins-2.303.3.1637595827-1.el8

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Container Platform 3.11Fixed RHSA-2021:4827
Red Hat OpenShift Container Platform 4.10Fixed RHSA-2022:0055
Red Hat OpenShift Container Platform 4.6Fixed RHSA-2021:4799
Red Hat OpenShift Container Platform 4.7Fixed RHSA-2021:4801
Red Hat OpenShift Container Platform 4.8Fixed RHSA-2021:4829
Red Hat OpenShift Container Platform 4.9Fixed RHSA-2021:4833
Not affected: 7 products
  • Red Hat Fuse 7
  • Red Hat OpenShift Container Platform 3.11
  • Red Hat OpenShift Container Platform 4.10
  • Red Hat OpenShift Container Platform 4.6
  • Red Hat OpenShift Container Platform 4.7
  • Red Hat OpenShift Container Platform 4.8
  • Red Hat OpenShift Container Platform 4.9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21691
  2. 2026-10-03 Alias added: GHSA-2c79-h2h5-g3fw

References

Advisory 2

Other 2

  • TI-2024-15885 Path traversal in Jenkins KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-14573 Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2015-04472 The Fingerprints pages in Jenkins before 1.638 and LTS before 1.625.2 might allow remote… KEVCVSS 3.1HIGH 7.5
  • TI-2016-07596 The remoting module in Jenkins before 2.32 and LTS before 2.19.3 allows remote attackers… CVSS 3.0CRITICAL 9.8
See all 293 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences