CVE-2026-33800

The record

An Unchecked Input for Loop Condition vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).Micro-BFD session flaps generate respective up/down events which are queued by PFEMAN for processing. Especially in a Virtual-Chassis (VC) scenario with locality‑bias configured, processing takes a significant amount of time for each event. If these sessions keep flapping, new events are constantly added, and in turn PFEMAN never completes processing these events. This results in the PFEMAN watchdog timer expiring, which causes the FPC to crash and restart, representing a complete service outage. This issue only affects MX series FPCs up to and including MPC9, and LC2101/2103 and LC480. It does not affect MPC10/11, LC4800/9600, and MX304. This issue affects Junos OS on MX Series: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2-S3, * 25.2 versions before 25.2R2.

Affected packages

Related vulnerabilities

• CVE-2026-93653 A denial of service flaw was found in Poppler's Splash backend. CWE-606
• CVE-2026-85730 smol-toml is a small, fast, and correct TOML parser and serializer. CWE-606
• CVE-2026-13761 Pega Platform versions 7.1.0 through 25.1.2 are affected by an improper validation of… CWE-606
• CVE-2026-16599 GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication… CWE-606
• CVE-2026-62901 Unchecked input for loop condition in .NET allows an unauthorized attacker to deny… CWE-606
• CVE-2026-71439 Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify… CWE-606
• CVE-2026-15172 FMP/NOTIFY protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16… CWE-606
• CVE-2026-11972 When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the… CWE-606