CVE-2023-36835
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
CVE-2023-36835 is a vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX10000 Series that allows a network-based attacker to cause a Denial of Service (DoS). Receiving a specific valid IP packet that needs to be routed over a VXLAN tunnel results in a PFE wedge condition, impacting traffic.
Risk Assessment
The organization may experience service availability disruptions, leading to operational interruptions and loss of customer trust. This issue does not cause a crash and restart scenario, and its effects persist until the device is rebooted.
Recommendation
It is recommended to update the Junos OS to a version that is not vulnerable to this flaw to minimize the risk of attack. Additionally, monitoring network traffic for potential exploitation attempts is advised.
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Original NVD description (English source)
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX10000 Series allows a network based attacker to cause a Denial of Service (DoS). If a specific valid IP packet is received and that packet needs to be routed over a VXLAN tunnel, this will result in a PFE wedge condition due to which traffic gets impacted. As this is not a crash and restart scenario, this condition will persist until the system is rebooted to recover. This issue affects Juniper Networks Junos OS on QFX10000: 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3-S5; 21.1 versions prior to 21.1R3-S5; 21.2 versions prior to 21.2R3-S5; 21.3 versions prior to 21.3R3-S4; 21.4 versions prior to 21.4R3-S1; 22.1 versions prior to 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R1-S2, 22.3R2.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

