Home

Description

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.

PUBLISHED Reserved 2026-01-05 | Published 2026-01-15 | Updated 2026-01-15 | Assigner juniper




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M

Problem types

CWE-1286 Improper Validation of Syntactic Correctness of Input

Product status

Default status
unaffected

23.2R2-S2 (semver) before 23.2R2-S5
affected

23.4R2-S1 (semver) before 23.4R2-S5
affected

24.2 (semver) before 24.2R2-S2
affected

24.4 (semver) before 24.4R1-S3, 24.4R2
affected

References

supportportal.juniper.net/JSA105996 vendor-advisory

kb.juniper.net/JSA105996 vendor-advisory

cve.org (CVE-2026-21917)

nvd.nist.gov (CVE-2026-21917)

Download JSON