CVE Catalog

CVE-2023-36835

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.54%

41th 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.

Related vulnerabilities

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