CVE-2026-21917

EPSS 0.12%
Veröffentlicht 15.01.2026 20:27:11
Zuletzt bearbeitet 23.01.2026 19:41:44
Quelle sirt@juniper.net
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An Improper Validation of Syntactic Correctness of Input vulnerability in the Web-Filtering module of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).

If an SRX device configured for UTM Web-Filtering receives a specifically malformed SSL packet, this will cause an FPC crash and restart.
This issue affects Junos OS on SRX Series:



  *  23.2 versions from 23.2R2-S2 before 23.2R2-S5, 
  *  23.4 versions from 23.4R2-S1 before 23.4R2-S5,
  *  24.2 versions before 24.2R2-S2,
  *  24.4 versions before 24.4R1-S3, 24.4R2.


Earlier versions of Junos are also affected, but no fix is available.

Betroffene Produkte Warnungen 0 Metriken 3 CWE 1 Referenzen 5

Verknüpft mit AI von unstrukturierten Daten zu bestehenden CPE der NVD

Diese Information steht angemeldeten Benutzern zur Verfügung.

Daten sind bereitgestellt durch National Vulnerability Database (NVD)

Juniper ≫ Junos Version23.2 Updater2-s2

   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 Version23.2 Updater2-s3

Juniper ≫ Junos Version23.2 Updater2-s4

Juniper ≫ Junos Version23.4 Updater2-s1

Juniper ≫ Junos Version23.4 Updater2-s2

Juniper ≫ Junos Version23.4 Updater2-s3

Juniper ≫ Junos Version23.4 Updater2-s4

Juniper ≫ Junos Version24.2 Update-

Juniper ≫ Junos Version24.2 Updater1

Juniper ≫ Junos Version24.2 Updater1-s1

Juniper ≫ Junos Version24.2 Updater1-s2

Juniper ≫ Junos Version24.2 Updater2

Juniper ≫ Junos Version24.2 Updater2-s1

Juniper ≫ Junos Version24.4 Update-

Juniper ≫ Junos Version24.4 Updater1

Juniper ≫ Junos Version24.4 Updater1-s2

Juniper ≫ Junos Version24.4 Updater2

Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.

EPSS Metriken
Typ	Quelle	Score	Percentile
EPSS	FIRST.org	0.12%	0.313

CVSS Metriken
Quelle	Base Score	Exploit Score	Impact Score	Vector String
sirt@juniper.net	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
sirt@juniper.net	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-1286 Improper Validation of Syntactic Correctness of Input

The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.

https://supportportal.juniper.net/JSA105996

Vendor Advisory

https://kb.juniper.net/JSA105996

Vendor Advisory

https://nvd.nist.gov/vuln/detail/CVE-2026-21917

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2026-21917

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2026-21917

EUVD