CVE-2026-57022: Junos OS: MX Series with SPC3, SRX Series: Specific packet in response to a TCP connection establishment by the affected device can crash the PFE
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX with SPC3 and SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
When an affected device initiates a TCP connection to an attacker-controlled system that responds with a specific packet, this causes a PFE crash and restart, which affects all services until the system has automatically recovered. This issue can happen among others in the following scenarios: ALG, SSL proxy, UTM, RTLOG, AppQoE probing, AAMW, ICAP, URL filtering.
This issue affects Junos OS on MX Series with SPC3, SRX5k Series with SPC3, SRX1600 Series, SRX2300 Series, SRX4000 Series, and vSRX Series:
all versions before 23.2R2-S4, 23.4 versions before 23.4R2-S5, 24.2 versions before 24.2R2.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Juniper Networks Junos OS (MX Series with SPC3; SRX Series with SPC3)to a version that resolves this vulnerability.Fixed in 22.4R3-S8 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series with SPC3; SRX Series with SPC3)to a version that resolves this vulnerability.Fixed in 23.2R2-S4 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series with SPC3; SRX Series with SPC3)to a version that resolves this vulnerability.Fixed in 23.4R2-S5 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series with SPC3; SRX Series with SPC3)to a version that resolves this vulnerability.Fixed in 24.2R2 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series with SPC3; SRX Series with SPC3)to a version that resolves this vulnerability.Fixed in 24.4R1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-57022?
The severity of CVE-2026-57022 is classified as high with a score of 8.2.
How do I fix CVE-2026-57022?
To mitigate CVE-2026-57022, apply the latest patches provided by Juniper Networks for the affected devices.
What impact does CVE-2026-57022 have on my network?
CVE-2026-57022 can allow an unauthenticated attacker to cause a Denial-of-Service (DoS), potentially impacting network availability.
Which devices are affected by CVE-2026-57022?
CVE-2026-57022 affects Juniper Networks Junos OS on MX Series with SPC3 and SRX Series devices.
What type of vulnerability is CVE-2026-57022?
CVE-2026-57022 is an Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine.