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CVE-2026-21920 is a high severity vulnerability with a CVSS score of 7.5. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
An Unchecked Return Value vulnerability in the DNS 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 Series device configured for DNS processing, receives a specifically formatted DNS request flowd will crash and restart, which causes a service interruption until the process has recovered.
This issue affects Junos OS on SRX Series:
This issue does not affect Junos OS versions before 23.4R1.
| Vendor | Product |
|---|---|
| Juniper | Srx4100 |
| Juniper |
Please cite this page when referencing data from Strobes VI. Proper attribution helps support our vulnerability intelligence research.
| Srx340 |
| Juniper | Srx5800 |
| Juniper | Junos |
| Juniper | Srx4200 |
| Juniper | Srx320 |
| Juniper | Srx4120 |
| Juniper | Srx5400 |
| Juniper | Srx5600 |
| Juniper | Srx4700 |
And 8 more...