Vulnerability Description
On PTX Series and QFX10k Series devices with the "inline-jflow" feature enabled, a use after free weakness in the Packet Forwarding Engine (PFE) microkernel architecture of Juniper Networks Junos OS may allow an attacker to cause a Denial of Service (DoS) condition whereby one or more Flexible PIC Concentrators (FPCs) may restart. As this is a race condition situation this issue become more likely to be hit when network instability occurs, such as but not limited to BGP/IGP reconvergences, and/or further likely to occur when more active "traffic flows" are occurring through the device. When this issue occurs, it will cause one or more FPCs to restart unexpectedly. During FPC restarts core files will be generated. While the core file is generated traffic will be disrupted. Sustained receipt of large traffic flows and reconvergence-like situations may sustain the Denial of Service (DoS) situation. This issue affects: Juniper Networks Junos OS: 18.1 version 18.1R2 and later versions prior to 18.1R3-S10 on PTX Series, QFX10K Series.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Juniper | Junos | 18.1 |
| Juniper | Ptx1000 | - |
| Juniper | Ptx10001-36Mr | - |
| Juniper | Ptx10002 | - |
| Juniper | Ptx10003 | - |
| Juniper | Ptx10004 | - |
| Juniper | Ptx10008 | - |
| Juniper | Ptx10016 | - |
| Juniper | Ptx3000 | - |
| Juniper | Ptx5000 | - |
| Juniper | Qfx10002 | - |
| Juniper | Qfx10008 | - |
| Juniper | Qfx10016 | - |
Related Weaknesses (CWE)
References
- https://kb.juniper.net/JSA11161Vendor Advisory
- https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/inliVendor Advisory
- https://kb.juniper.net/JSA11161Vendor Advisory
- https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/inliVendor Advisory
FAQ
What is CVE-2021-0270?
CVE-2021-0270 is a vulnerability with a CVSS score of 7.5 (HIGH). On PTX Series and QFX10k Series devices with the "inline-jflow" feature enabled, a use after free weakness in the Packet Forwarding Engine (PFE) microkernel architecture of Juniper Networks Junos OS m...
How severe is CVE-2021-0270?
CVE-2021-0270 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-0270?
Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos, Juniper Ptx1000, Juniper Ptx10001-36Mr, Juniper Ptx10002, Juniper Ptx10003.