High severity7.5NVD Advisory· Published Jan 15, 2026· Updated Jun 17, 2026
CVE-2026-21917
CVE-2026-21917
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.
Affected products
19cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*+ 18 more
- cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:23.2:r2-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:23.2:r2-s4:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:23.4:r2-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:23.4:r2-s4:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.2:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:*
- (no CPE)range: 23.2R2-S2 through 23.2R2-S4, 23.4R2-S1 through 23.4R2-S4, 24.2R1 through 24.2R1-S1, 24.4R1 through 24.4R1-S2, 24.4R2
- (no CPE)range: 23.2R2-S2
Patches
Vulnerability mechanics
References
2- kb.juniper.net/JSA105996nvdVendor Advisory
- supportportal.juniper.net/JSA105996nvdVendor Advisory
News mentions
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