CVE-2026-33800

EPSS 0.17%
Veröffentlicht 09.07.2026 21:03:00
Zuletzt bearbeitet 26.08.2026 16:56:41
Erkennungen
Login

Junos OS: MX Series: In a VC scenario a high rate of micro-BFD session flaps will cause an FPC crash

An Unchecked Input for Loop Condition vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).Micro-BFD session flaps generate respective up/down events which are queued by PFEMAN for processing. Especially in a Virtual-Chassis (VC) scenario with locality‑bias configured, processing takes a significant amount of time for each event. If these sessions keep flapping, new events are constantly added, and in turn PFEMAN never completes processing these events. This results in the PFEMAN watchdog timer expiring, which causes the FPC to crash and restart, representing a complete service outage.


This issue only affects MX series FPCs up to and including MPC9, and LC2101/2103 and LC480. It does not affect MPC10/11, LC4800/9600, and MX304.

This issue affects Junos OS on MX Series:


  *  all versions before 23.2R2-S7,
  *  23.4 versions before 23.4R2-S8,
  *  24.2 versions before 24.2R2-S4,
  *  24.4 versions before 24.4R2-S3,
  *  25.2 versions before 25.2R2.

Betroffene Produkte Warnungen 0 Metriken 3 CWE 1 Referenzen 4

NVD 42 VulnDex Vulnerability Enrichment 1

Daten sind bereitgestellt durch National Vulnerability Database (NVD)

Juniper ≫ Junos Version < 23.2

   Juniper ≫ Lc2101 Version -
   Juniper ≫ Lc2103 Version -
   Juniper ≫ Lc4800 Version -
   Juniper ≫ Mpc1 Version -
   Juniper ≫ Mpc1 Q Version -
   Juniper ≫ Mpc1e Version -
   Juniper ≫ Mpc1e Q Version -
   Juniper ≫ Mpc2 Version -
   Juniper ≫ Mpc2 Eq Version -
   Juniper ≫ Mpc2 Q Version -
   Juniper ≫ Mpc2e Version -
   Juniper ≫ Mpc2e Eq Version -
   Juniper ≫ Mpc2e Ng Version -
   Juniper ≫ Mpc2e Ng Q Version -
   Juniper ≫ Mpc2e P Version -
   Juniper ≫ Mpc2e Q Version -
   Juniper ≫ Mpc3e Version -
   Juniper ≫ Mpc3e-3d-ng Version -
   Juniper ≫ Mpc3e-3d-ng-q Version -
   Juniper ≫ Mpc6e Version -
   Juniper ≫ Mpc7e-10g Version -
   Juniper ≫ Mpc7e-mrate Version -
   Juniper ≫ Mpc8e Version -
   Juniper ≫ Mpc9e Version -

Juniper ≫ Junos Version 23.2 Update r1

Juniper ≫ Junos Version 23.2 Update r1-s1

Juniper ≫ Junos Version 23.2 Update r1-s2

Juniper ≫ Junos Version 23.2 Update r2

Juniper ≫ Junos Version 23.2 Update r2-s1

Juniper ≫ Junos Version 23.2 Update r2-s2

Juniper ≫ Junos Version 23.2 Update r2-s3

Juniper ≫ Junos Version 23.2 Update r2-s4

Juniper ≫ Junos Version 23.2 Update r2-s5

Juniper ≫ Junos Version 23.2 Update r2-s6

Juniper ≫ Junos Version 23.4 Update -

Juniper ≫ Junos Version 23.4 Update r1

Juniper ≫ Junos Version 23.4 Update r1-s1

Juniper ≫ Junos Version 23.4 Update r1-s2

Juniper ≫ Junos Version 23.4 Update r2

Juniper ≫ Junos Version 23.4 Update r2-s1

Juniper ≫ Junos Version 23.4 Update r2-s2

Juniper ≫ Junos Version 23.4 Update r2-s3

Juniper ≫ Junos Version 23.4 Update r2-s4

Juniper ≫ Junos Version 23.4 Update r2-s5

Juniper ≫ Junos Version 23.4 Update r2-s6

Juniper ≫ Junos Version 23.4 Update r2-s7

Juniper ≫ Junos Version 24.2 Update -

Juniper ≫ Junos Version 24.2 Update r1

Juniper ≫ Junos Version 24.2 Update r1-s1

Juniper ≫ Junos Version 24.2 Update r1-s2

Juniper ≫ Junos Version 24.2 Update r2

Juniper ≫ Junos Version 24.2 Update r2-s1

Juniper ≫ Junos Version 24.2 Update r2-s2

Juniper ≫ Junos Version 24.2 Update r2-s3

Juniper ≫ Junos Version 24.4 Update -

Juniper ≫ Junos Version 24.4 Update r1

Juniper ≫ Junos Version 24.4 Update r1-s2

Juniper ≫ Junos Version 24.4 Update r1-s3

Juniper ≫ Junos Version 24.4 Update r2

Juniper ≫ Junos Version 24.4 Update r2-s1

Juniper ≫ Junos Version 24.4 Update r2-s2

Juniper ≫ Junos Version 25.2 Update -

Juniper ≫ Junos Version 25.2 Update r1

Juniper ≫ Junos Version 25.2 Update r1-s1

Juniper ≫ Junos Version 25.2 Update r1-s2

VulnDex Vulnerability Enrichment

Diese Information steht angemeldeten Benutzern zur Verfügung.

Zu dieser CVE wurde keine Warnung gefunden.

EPSS Metriken
Typ	Quelle	Score	Percentile
EPSS	FIRST.org	0.17%	0.061

CVSS Metriken
Quelle	Base Score	Exploit Score	Impact Score	Vector String
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:X/RE:M/U:X
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

CWE-606 Unchecked Input for Loop Condition

The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping.

https://supportportal.juniper.net/JSA110075

Vendor Advisory

https://nvd.nist.gov/vuln/detail/CVE-2026-33800

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2026-33800

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2026-33800

EUVD

Team-orientierte Vulnerability Management Plattform

Features der Plattform

CVE-2026-33800