6.8

CVE-2026-21912

A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the method to collect FPC Ethernet firmware statistics of Juniper Networks Junos OS on MX10k Series allows a local, low-privileged attacker executing the 'show system firmware' CLI command to cause an LC480 or LC2101 line card to reset.

On MX10k Series systems with LC480 or LC2101 line cards, repeated execution of the 'show system firmware' CLI command can cause the line card to crash and restart. Additionally, some time after the line card crashes, chassisd may also crash and restart, generating a core dump.This issue affects Junos OS on MX10k Series: 



  *  all versions before 21.2R3-S10, 
  *  from 21.4 before 21.4R3-S9, 
  *  from 22.2 before 22.2R3-S7, 
  *  from 22.4 before 22.4R3-S6, 
  *  from 23.2 before 23.2R2-S2, 
  *  from 23.4 before 23.4R2-S3, 
  *  from 24.2 before 24.2R2.
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Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerJuniper Networks
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Produkt Junos OS
Default Statusunaffected
Version < 21.2R3-S10
Version 0
Status affected
Version < 21.4R3-S9
Version 21.4
Status affected
Version < 22.2R3-S7
Version 22.2
Status affected
Version < 22.4R3-S6
Version 22.4
Status affected
Version < 23.2R2-S2
Version 23.2
Status affected
Version < 23.4R2-S3
Version 23.4
Status affected
Version < 24.2R2
Version 24.2
Status affected
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.01% 0.018
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
sirt@juniper.net 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
sirt@juniper.net 6.8 0 0
CVSS:4.0/AV:L/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:Amber
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.