6.5

CVE-2026-21911

Junos OS Evolved: Flapping management interface causes MAC learning on label-switched interfaces to stop

An Incorrect Calculation vulnerability in the Layer 2 Control

Protocol 

 Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage.

When the issue is seen, the following log message will be generated:

op:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0  rtt-id:51 p_ifl:0  fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP, 


This issue affects Junos OS Evolved: 

  *  all versions before 21.4R3-S7-EVO, 
  *  from 22.2 before 22.2R3-S4-EVO, 
  *  from 22.3 before 22.3R3-S3-EVO, 
  *  from 22.4 before 22.4R3-S2-EVO, 
  *  from 23.2 before 23.2R2-S1-EVO, 
  *  from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Juniper ≫ Junos Os Evolved Version < 21.4
Juniper ≫ Junos Os Evolved Version 21.4 Update -
Juniper ≫ Junos Os Evolved Version 21.4 Update r1
Juniper ≫ Junos Os Evolved Version 21.4 Update r1-s1
Juniper ≫ Junos Os Evolved Version 21.4 Update r1-s2
Juniper ≫ Junos Os Evolved Version 21.4 Update r2
Juniper ≫ Junos Os Evolved Version 21.4 Update r2-s1
Juniper ≫ Junos Os Evolved Version 21.4 Update r2-s2
Juniper ≫ Junos Os Evolved Version 21.4 Update r3
Juniper ≫ Junos Os Evolved Version 21.4 Update r3-s1
Juniper ≫ Junos Os Evolved Version 21.4 Update r3-s2
Juniper ≫ Junos Os Evolved Version 21.4 Update r3-s3
Juniper ≫ Junos Os Evolved Version 21.4 Update r3-s4
Juniper ≫ Junos Os Evolved Version 21.4 Update r3-s5
Juniper ≫ Junos Os Evolved Version 21.4 Update r3-s6
Juniper ≫ Junos Os Evolved Version 22.2 Update -
Juniper ≫ Junos Os Evolved Version 22.2 Update r1
Juniper ≫ Junos Os Evolved Version 22.2 Update r1-s1
Juniper ≫ Junos Os Evolved Version 22.2 Update r1-s2
Juniper ≫ Junos Os Evolved Version 22.2 Update r2
Juniper ≫ Junos Os Evolved Version 22.2 Update r2-s1
Juniper ≫ Junos Os Evolved Version 22.2 Update r2-s2
Juniper ≫ Junos Os Evolved Version 22.2 Update r3
Juniper ≫ Junos Os Evolved Version 22.2 Update r3-s1
Juniper ≫ Junos Os Evolved Version 22.2 Update r3-s2
Juniper ≫ Junos Os Evolved Version 22.2 Update r3-s3
Juniper ≫ Junos Os Evolved Version 22.3 Update -
Juniper ≫ Junos Os Evolved Version 22.3 Update r1
Juniper ≫ Junos Os Evolved Version 22.3 Update r1-s1
Juniper ≫ Junos Os Evolved Version 22.3 Update r1-s2
Juniper ≫ Junos Os Evolved Version 22.3 Update r2
Juniper ≫ Junos Os Evolved Version 22.3 Update r2-s1
Juniper ≫ Junos Os Evolved Version 22.3 Update r2-s2
Juniper ≫ Junos Os Evolved Version 22.3 Update r3
Juniper ≫ Junos Os Evolved Version 22.3 Update r3-s1
Juniper ≫ Junos Os Evolved Version 22.3 Update r3-s2
Juniper ≫ Junos Os Evolved Version 22.4 Update -
Juniper ≫ Junos Os Evolved Version 22.4 Update r1
Juniper ≫ Junos Os Evolved Version 22.4 Update r1-s1
Juniper ≫ Junos Os Evolved Version 22.4 Update r1-s2
Juniper ≫ Junos Os Evolved Version 22.4 Update r2
Juniper ≫ Junos Os Evolved Version 22.4 Update r2-s1
Juniper ≫ Junos Os Evolved Version 22.4 Update r2-s2
Juniper ≫ Junos Os Evolved Version 22.4 Update r3
Juniper ≫ Junos Os Evolved Version 22.4 Update r3-s1
Juniper ≫ Junos Os Evolved Version 23.2 Update -
Juniper ≫ Junos Os Evolved Version 23.2 Update r1
Juniper ≫ Junos Os Evolved Version 23.2 Update r1-s1
Juniper ≫ Junos Os Evolved Version 23.2 Update r1-s2
Juniper ≫ Junos Os Evolved Version 23.2 Update r2
Juniper ≫ Junos Os Evolved Version 23.4 Update -
Juniper ≫ Junos Os Evolved Version 23.4 Update r1
Juniper ≫ Junos Os Evolved Version 23.4 Update r1-s1
Juniper ≫ Junos Os Evolved Version 23.4 Update r2
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.24% 0.147
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Juniper 6.5 2.8 3.6
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Juniper 7.1 0 0
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/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:C/RE:M/U:Amber
CWE-682 Incorrect Calculation

The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.

https://supportportal.juniper.net/JSA106010
Vendor Advisory
https://kb.juniper.net/JSA106010
Vendor Advisory