CVE-2026-102086
Junos OS: SRX Series: Multiple DNS queries processed by SecIntel and DGA in the same session cause a flowd crash
Juniper Networks Junos OSNetwork & edge
CVSS
5.9MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.37%Chance of exploitation activity in the next 30 days, higher than 29% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 23.2R2-S7.7Junos OSCVE List
- 23.4R2-S8.13Junos OSCVE List
- 24.2R2-S5.5Junos OSCVE List
- 24.4R2-S4Junos OSCVE List
- 25.2R2-S1Junos OSCVE List
- 25.4R1-S2Junos OSCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
A NULL Pointer Dereference vulnerability in the DNS plugin of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).
When multiple DNS queries are received in a single flow session, where one query matches a Security Intelligence (SecIntel) feed and another query is sent for DNS Domain Generation Algorithm (DGA) analysis, an error in processing logging of these asynchronous tasks can lead to an FPC crash. The exact timing conditions are outside an attacker's direct control.
This issue affects Junos OS on SRX Series:
- All versions before 23.2R2-S7.7;
- from 23.4 before 23.4R2-S8.13;
- from 24.2 before 24.2R2-S5.5;
- from 24.4 before 24.4R2-S4;
- from 25.2 before 25.2R2-S1;
- from 25.4 before 25.4R1-S2.
Text from CVE List
Affected versions 6
- Junos OSaffected: all versions before 23.2R2-S7.7CVE List
- Junos OSaffected: 23.4 before 23.4R2-S8.13CVE List
- Junos OSaffected: 24.2 before 24.2R2-S5.5CVE List
- Junos OSaffected: 24.4 before 24.4R2-S4CVE List
- Junos OSaffected: 25.2 before 25.2R2-S1CVE List
- Junos OSaffected: 25.4 before 25.4R1-S2CVE List