CVE-2026-21918

EPSS 0.38%
Veröffentlicht 15.01.2026 20:27:54
Zuletzt bearbeitet 23.01.2026 19:41:38
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Junos OS: SRX and MX Series: When TCP packets occur in a specific sequence flowd crashes

A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX and MX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). On all SRX and MX Series platforms, when during TCP session establishment a specific sequence of packets is encountered a double free happens. This causes flowd to crash and the respective FPC to restart.





This issue affects Junos OS on SRX and MX Series:



  *  all versions before 22.4R3-S7,
  *  23.2 versions before 23.2R2-S3,
  *  23.4 versions before 23.4R2-S4,
  *  24.2 versions before 24.2R2.

Betroffene Produkte Warnungen 0 Metriken 3 CWE 1 Referenzen 5

NVD 34 VulnDex Vulnerability Enrichment 1

Daten sind bereitgestellt durch National Vulnerability Database (NVD)

Juniper ≫ Junos Version < 22.4

   Juniper ≫ Mx10004 Version -
   Juniper ≫ Mx10008 Version -
   Juniper ≫ Mx2008 Version -
   Juniper ≫ Mx2010 Version -
   Juniper ≫ Mx2020 Version -
   Juniper ≫ Mx204 Version -
   Juniper ≫ Mx240 Version -
   Juniper ≫ Mx304 Version -
   Juniper ≫ Mx480 Version -
   Juniper ≫ Mx960 Version -
   Juniper ≫ Srx1500 Version -
   Juniper ≫ Srx1600 Version -
   Juniper ≫ Srx2300 Version -
   Juniper ≫ Srx300 Version -
   Juniper ≫ Srx320 Version -
   Juniper ≫ Srx340 Version -
   Juniper ≫ Srx345 Version -
   Juniper ≫ Srx380 Version -
   Juniper ≫ Srx4100 Version -
   Juniper ≫ Srx4120 Version -
   Juniper ≫ Srx4200 Version -
   Juniper ≫ Srx4300 Version -
   Juniper ≫ Srx4600 Version -
   Juniper ≫ Srx4700 Version -
   Juniper ≫ Srx5400 Version -
   Juniper ≫ Srx5600 Version -
   Juniper ≫ Srx5800 Version -

Juniper ≫ Junos Version 22.4 Update -

Juniper ≫ Junos Version 22.4 Update r1

Juniper ≫ Junos Version 22.4 Update r1-s1

Juniper ≫ Junos Version 22.4 Update r1-s2

Juniper ≫ Junos Version 22.4 Update r2

Juniper ≫ Junos Version 22.4 Update r2-s1

Juniper ≫ Junos Version 22.4 Update r2-s2

Juniper ≫ Junos Version 22.4 Update r3

Juniper ≫ Junos Version 22.4 Update r3-s1

Juniper ≫ Junos Version 22.4 Update r3-s2

Juniper ≫ Junos Version 22.4 Update r3-s3

Juniper ≫ Junos Version 22.4 Update r3-s4

Juniper ≫ Junos Version 22.4 Update r3-s5

Juniper ≫ Junos Version 22.4 Update r3-s6

Juniper ≫ Junos Version 23.2 Update -

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 23.4 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 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

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	0.38%	0.312

CVSS Metriken
Quelle	Base Score	Exploit Score	Impact Score	Vector String
Juniper	7.5	3.9	3.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Juniper	8.7	0	0	CVSS:4.0/AV:N/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

CWE-415 Double Free

The product calls free() twice on the same memory address.

https://supportportal.juniper.net/JSA106018

Vendor Advisory

https://kb.juniper.net/JSA106018

Vendor Advisory

https://nvd.nist.gov/vuln/detail/CVE-2026-21918

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2026-21918

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2026-21918

EUVD

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CVE-2026-21918