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BIT-jenkins-2020-2100

Affected: Bitnami: jenkins

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier was vulnerable to a UDP amplification reflection denial of service attack on port 33848.

EUVD-2026-35785

fkie_cve-2020-2100

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier was vulnerable to a UDP amplification reflection denial of service attack on port 33848.

GHSA-gpxv-776p-7gc7 — Jenkins vulnerable to UDP amplification reflection attack

Affected: Maven: org.jenkins-ci.main:jenkins-core

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier supports two network discovery services (UDP multicast/broadcast and DNS multicast) by default.

The UDP multicast/broadcast service can be used in an amplification reflection attack, as very few bytes sent to the respective endpoint result in much larger responses: A single byte request to this service would respond with more than 100 bytes of Jenkins metadata which could be used in a DDoS attack on a Jenkins controller. Within the same network, spoofed UDP packets could also be sent to make two Jenkins controllers go into an infinite loop of replies to one another, thus causing a denial of service.

Jenkins 2.219, LTS 2.204.2 now disables both UDP multicast/broadcast and DNS multicast by default.

Administrators that need these features can re-enable them again by setting the system property `hudson.DNSMultiCast.disabled` to `false` (for DNS multicast) or the system property `hudson.udp` to `33848`, or another port (for UDP broadcast/multicast). These are the same system properties that controlled whether these features were enabled in the past, so any instances explicitly enabling these features by setting these system properties will continue to have them enabled.

gsd-2020-2100

RHBA-2020:0402 — Red Hat Bug Fix Advisory: OpenShift Container Platform 3.11 bug fix update

jquery: Prototype pollution in object's prototype leading to denial of service, remote code execution, or property injection jenkins: Inbound TCP Agent Protocol/3 authentication bypass jenkins: UDP multicast/broadcast service amplification reflection attack jenkins: Non-constant time comparison of inbound TCP agent connection secret jenkins: Non-constant time HMAC comparison jenkins: Exposed session identifiers on user detail object in the whoAmI diagnostic page jenkins: Memory usage graphs accessible to anyone with Overall/Read jenkins: REST APIs vulnerable to clickjacking