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CVE-2020-2101

Non-constant time comparison of inbound TCP agent connection secret

5.3 MediumFix available

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

1.37%Down 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.3

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.

Record
CVE-2020-2101
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:P/I:N/A:N
Weakness
CWE-203
Updated
2026-11-02
CVE List No score

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.

Record
CVE-2020-2101
Updated
2026-11-02
EUVDEUVD-2022-5526 No score

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.

Record
EUVD-2022-5526
Updated
2026-11-03
GitHub AdvisoriesGHSA-w7jr-wqw6-54xc 5.3

Non-constant time comparison of inbound TCP agent connection secret

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison validating the connection secret when an inbound TCP agent connection is initiated. This could potentially allow attackers to use statistical methods to obtain the connection secret.

Jenkins 2.219, LTS 2.204.2 now uses a constant-time comparison function for verifying connection secrets.

Record
GHSA-w7jr-wqw6-54xc
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-203, CWE-208
Updated
2026-11-02
OSV 5.3

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.

Record
CVE-2020-2101
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVGHSA-w7jr-wqw6-54xc 5.3

Non-constant time comparison of inbound TCP agent connection secret

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison validating the connection secret when an inbound TCP agent connection is initiated. This could potentially allow attackers to use statistical methods to obtain the connection secret.

Jenkins 2.219, LTS 2.204.2 now uses a constant-time comparison function for verifying connection secrets.

Record
GHSA-w7jr-wqw6-54xc
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-203, CWE-208
Updated
2026-11-02
OSVRHBA-2020:0402 8.6

Red Hat Bug Fix Advisory: OpenShift Container Platform 3.11 bug fix update

Record
RHBA-2020:0402
CVSS 3.1
8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Updated
2026-11-02
OSVRHBA-2020:0675 8.6

Red Hat Bug Fix Advisory: OpenShift Container Platform 4.3.5 packages update

Record
RHBA-2020:0675
CVSS 3.1
8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Updated
2026-11-02
OSVBIT-jenkins-2020-2101 No score

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.

Record
BIT-jenkins-2020-2101
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.jenkins-ci.main:jenkins-core
Maven
 through 2.204.1
2.204.2
org.jenkins-ci.main:jenkins-core
Maven
 2.205 to 2.218
2.219
jenkins
Bitnami
 before 2.218.1
2.218.1
org.jenkins-ci.main:jenkins-core
Maven
 before 2.204.2, plus listed versions
1.3961.3971.3981.3991.400
Show 45 moreShow less
1.4011.4031.4041.4051.4061.4071.4081.4091.409.11.409.21.409.31.4101.4111.4121.4131.4141.4151.4161.4171.4181.4191.4201.4211.4221.4231.4241.424.11.424.21.424.31.424.41.424.51.424.61.4251.4261.4271.4281.4291.4301.4311.4321.4331.4341.4351.4361.437
2.204.2
org.jenkins-ci.main:jenkins-core
Maven
 2.205 up to 2.219, plus listed versions
2.2062.2072.2082.2092.210
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2.2112.2122.2132.2142.2152.2162.2172.218
2.219
atomic-enterprise-service-catalog
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 1:3.11.170-1.git.1.91db82e.el7
1:3.11.170-1.git.1.91db82e.el7
atomic-enterprise-service-catalog-svcat
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 1:3.11.170-1.git.1.91db82e.el7
1:3.11.170-1.git.1.91db82e.el7
atomic-openshift
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-clients
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-clients-redistributable
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
Show 41 moreShow less
Affected packages
PackageAffectedFixed
atomic-openshift-cluster-autoscaler
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.0a0df6a.el7
0:3.11.170-1.git.1.0a0df6a.el7
atomic-openshift-descheduler
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.9ad83f2.el7
0:3.11.170-1.git.1.9ad83f2.el7
atomic-openshift-docker-excluder
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-dockerregistry
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.55fab05.el7
0:3.11.170-1.git.1.55fab05.el7
atomic-openshift-excluder
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-hyperkube
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-hypershift
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-master
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-metrics-server
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.357f177.el7
0:3.11.170-1.git.1.357f177.el7
atomic-openshift-node
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-node-problem-detector
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.b1f90a6.el7
0:3.11.170-1.git.1.b1f90a6.el7
atomic-openshift-pod
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-sdn-ovs
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-service-idler
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.8328979.el7
0:3.11.170-1.git.1.8328979.el7
atomic-openshift-template-service-broker
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-tests
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.0.00cac56.el7
0:3.11.170-1.git.0.00cac56.el7
atomic-openshift-web-console
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.3d64e8b.el7
0:3.11.170-1.git.1.3d64e8b.el7
cri-o
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7
0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7
cri-o-debuginfo
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7
0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7
golang-github-openshift-oauth-proxy
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.b49be83.el7
0:3.11.170-1.git.1.b49be83.el7
golang-github-prometheus-alertmanager
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.61d7960.el7
0:3.11.170-1.git.1.61d7960.el7
golang-github-prometheus-node_exporter
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.51473b7.el7
0:3.11.170-1.git.1.51473b7.el7
golang-github-prometheus-prometheus
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.227bc98.el7
0:3.11.170-1.git.1.227bc98.el7
jenkins
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:2.204.2.1580891656-1.el7
0:2.204.2.1580891656-1.el7
jenkins-2-plugins
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.1579107288-1.el7
0:3.11.1579107288-1.el7
openshift-ansible
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-2.git.5.8802564.el7
0:3.11.170-2.git.5.8802564.el7
openshift-ansible-docs
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-2.git.5.8802564.el7
0:3.11.170-2.git.5.8802564.el7
openshift-ansible-playbooks
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-2.git.5.8802564.el7
0:3.11.170-2.git.5.8802564.el7
openshift-ansible-roles
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-2.git.5.8802564.el7
0:3.11.170-2.git.5.8802564.el7
openshift-ansible-test
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-2.git.5.8802564.el7
0:3.11.170-2.git.5.8802564.el7
openshift-enterprise-autoheal
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.dfe6c52.el7
0:3.11.170-1.git.1.dfe6c52.el7
openshift-enterprise-cluster-capacity
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.661684b.el7
0:3.11.170-1.git.1.661684b.el7
openshift-kuryr
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.7265da1.el7
0:3.11.170-1.git.1.7265da1.el7
openshift-kuryr-cni
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.7265da1.el7
0:3.11.170-1.git.1.7265da1.el7
openshift-kuryr-common
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.7265da1.el7
0:3.11.170-1.git.1.7265da1.el7
openshift-kuryr-controller
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.7265da1.el7
0:3.11.170-1.git.1.7265da1.el7
prometheus
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.227bc98.el7
0:3.11.170-1.git.1.227bc98.el7
prometheus-alertmanager
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.61d7960.el7
0:3.11.170-1.git.1.61d7960.el7
prometheus-node-exporter
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.51473b7.el7
0:3.11.170-1.git.1.51473b7.el7
python2-kuryr-kubernetes
Red Hat:openshift:3.11::el7
From an advisory covering 8 CVEs
 before 0:3.11.170-1.git.1.7265da1.el7
0:3.11.170-1.git.1.7265da1.el7
jenkins
Red Hat:openshift:4.3::el7
From an advisory covering 7 CVEs
 before 0:2.204.2.1583446818-1.el7
0:2.204.2.1583446818-1.el7

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-2101 is a medium vulnerability (CVSS 5.3) in Jenkins, published January 29, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.37%, the 71st percentile. Fixed in org.jenkins-ci.main:jenkins-core 2.204.2.

References

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Left out here: 530 versions. The JSON record has them.

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