7.1

CVE-2026-21921

A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).

When telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.

This issue affects:

 Junos OS: 



  *  all versions before 22.4R3-S8,
  *  23.2 versions before 23.2R2-S5,
  *  23.4 versions before 23.4R2;




Junos OS Evolved:



  *  all versions before 22.4R3-S8-EVO,
  *  23.2 versions before 23.2R2-S5-EVO,
  *  23.4 versions before 23.4R2-EVO.
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Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Juniper ≫ Junos Version < 22.4
Juniper ≫ Junos Version22.4 Update-
Juniper ≫ Junos Version22.4 Updater1
Juniper ≫ Junos Version22.4 Updater1-s1
Juniper ≫ Junos Version22.4 Updater1-s2
Juniper ≫ Junos Version22.4 Updater2
Juniper ≫ Junos Version22.4 Updater2-s1
Juniper ≫ Junos Version22.4 Updater2-s2
Juniper ≫ Junos Version22.4 Updater3
Juniper ≫ Junos Version22.4 Updater3-s1
Juniper ≫ Junos Version22.4 Updater3-s2
Juniper ≫ Junos Version22.4 Updater3-s3
Juniper ≫ Junos Version22.4 Updater3-s4
Juniper ≫ Junos Version22.4 Updater3-s5
Juniper ≫ Junos Version22.4 Updater3-s6
Juniper ≫ Junos Version22.4 Updater3-s7
Juniper ≫ Junos Version23.2 Update-
Juniper ≫ Junos Version23.2 Updater1
Juniper ≫ Junos Version23.2 Updater1-s1
Juniper ≫ Junos Version23.2 Updater1-s2
Juniper ≫ Junos Version23.2 Updater2
Juniper ≫ Junos Version23.2 Updater2-s1
Juniper ≫ Junos Version23.2 Updater2-s2
Juniper ≫ Junos Version23.2 Updater2-s3
Juniper ≫ Junos Version23.2 Updater2-s4
Juniper ≫ Junos Version23.4 Update-
Juniper ≫ Junos Version23.4 Updater1
Juniper ≫ Junos Version23.4 Updater1-s1
Juniper ≫ Junos Version23.4 Updater1-s2
Juniper ≫ Junos Os Evolved Version < 22.4
Juniper ≫ Junos Os Evolved Version22.4 Update-
Juniper ≫ Junos Os Evolved Version22.4 Updater1
Juniper ≫ Junos Os Evolved Version22.4 Updater1-s1
Juniper ≫ Junos Os Evolved Version22.4 Updater1-s2
Juniper ≫ Junos Os Evolved Version22.4 Updater2
Juniper ≫ Junos Os Evolved Version22.4 Updater2-s1
Juniper ≫ Junos Os Evolved Version22.4 Updater2-s2
Juniper ≫ Junos Os Evolved Version22.4 Updater3
Juniper ≫ Junos Os Evolved Version22.4 Updater3-s1
Juniper ≫ Junos Os Evolved Version22.4 Updater3-s2
Juniper ≫ Junos Os Evolved Version22.4 Updater3-s3
Juniper ≫ Junos Os Evolved Version22.4 Updater3-s4
Juniper ≫ Junos Os Evolved Version22.4 Updater3-s5
Juniper ≫ Junos Os Evolved Version22.4 Updater3-s6
Juniper ≫ Junos Os Evolved Version22.4 Updater3-s7
Juniper ≫ Junos Os Evolved Version23.2 Update-
Juniper ≫ Junos Os Evolved Version23.2 Updater1
Juniper ≫ Junos Os Evolved Version23.2 Updater1-s1
Juniper ≫ Junos Os Evolved Version23.2 Updater1-s2
Juniper ≫ Junos Os Evolved Version23.2 Updater2
Juniper ≫ Junos Os Evolved Version23.2 Updater2-s1
Juniper ≫ Junos Os Evolved Version23.2 Updater2-s2
Juniper ≫ Junos Os Evolved Version23.2 Updater2-s3
Juniper ≫ Junos Os Evolved Version23.2 Updater2-s4
Juniper ≫ Junos Os Evolved Version23.4 Update-
Juniper ≫ Junos Os Evolved Version23.4 Updater1
Juniper ≫ Junos Os Evolved Version23.4 Updater1-s1
Juniper ≫ Junos Os Evolved Version23.4 Updater1-s2
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.04% 0.123
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
sirt@juniper.net 6.5 2.8 3.6
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
sirt@juniper.net 7.1 0 0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:M/U:X
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.