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Juniper Networks disclosed two Junos OS vulnerabilities affecting multiple product lines that can trigger sustained memory growth and service disruption under specific network conditions. On MX Series devices, CVE-2026-33782 causes the jdhcpd process to continuously increase memory usage in certain DHCPv6 scenarios involving subscriber logouts, creating a risk of resource exhaustion on affected systems.
A separate flaw, CVE-2026-33781, impacts EX Series and QFX Series switches in VXLAN deployments, where receipt of specific control-protocol packets can cause a memory leak that eventually results in a state where no traffic is passed. The advisories indicate that both issues are denial-of-service style conditions tied to memory exhaustion, with the affected behavior depending on particular protocol and deployment scenarios in Juniper environments.
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Juniper issued a security bulletin for CVE-2026-33775 affecting Junos OS MX Series devices. The advisory describes a memory leak in bbe-smgd caused by a mismatch between configured and received packet types.
Juniper issued a security bulletin for CVE-2026-33782 affecting Junos OS MX Series devices. In specific DHCPv6 scenarios, the jdhcpd process memory increases continuously with subscriber logouts.
Juniper issued a security bulletin describing CVE-2026-33781 affecting Junos OS on EX Series and QFX Series devices. In a VXLAN scenario, receipt of specific control protocol packets can cause memory leaks and eventually prevent traffic from being passed.
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Juniper Networks disclosed **CVE-2026-33782**, a high-severity flaw in the `jdhcpd` DHCP daemon on **Junos OS MX Series** devices that can trigger a memory leak and lead to denial of service. The issue affects deployments using **DHCPv6 over PPPoE** or **DHCPv6 over VLAN** when **Active lease query** or **Bulk lease query** is enabled, causing memory consumption to increase with each subscriber logout until `jdhcpd` crashes and restarts. The resulting process failure can cause complete service impact until recovery. Juniper said affected versions include all releases before **22.4R3-S1**, **23.2** releases before **23.2R2**, and **23.4** releases before **23.4R2**. Administrators can monitor for abnormal growth in daemon memory usage with: ```bash show system processes extensive | match jdhcpd ```
Jun 29, 2026
Juniper Networks disclosed multiple high-severity vulnerabilities in **Junos OS** and **SRX/MX** platforms, including remotely exploitable denial-of-service flaws and local privilege-escalation issues. The most exposed bugs include **`CVE-2026-33790`**, which lets an unauthenticated attacker crash the `srxpfe` packet forwarding engine on **SRX Series** firewalls by sending a malformed **ICMPv6** packet to devices with **NAT64** enabled, and **`CVE-2026-33778`**, which allows a malformed initial **ISAKMP** packet to crash the `kmd` or `iked` daemons on **SRX** and **MX** systems providing IPsec VPN services. Juniper said repeated exploitation can sustain outages by forcing affected processes into crash loops, and that fixes were released through security bulletins including **`JSA107874`** and **`JSA107868`**. Juniper also fixed **`CVE-2026-33785`**, a missing authorization flaw in **MX Series** routers that allows any locally authenticated user to run privileged `request csds` commands and potentially compromise managed infrastructure in **JDM/CSDS** deployments, and **`CVE-2026-21916`**, a symlink-handling bug in the Junos CLI that can let a low-privileged user gain **root** when another user performs a configuration commit. Affected versions span several supported Junos release trains, with fixes issued on April 8, 2026; some older branches, including certain end-of-life releases, do not have patches. Detection guidance from Juniper and Tenable relies largely on version auditing, configuration review for exposed features such as NAT64 and IPsec, and monitoring for daemon crashes, suspicious `file link` activity, unexpected root access, and abuse of privileged management commands.
Jun 29, 2026
Juniper disclosed two denial-of-service vulnerabilities in **Junos OS Evolved** affecting **PTX Series** routers, with one issue also impacting the **QFX5000 Series**. The first flaw, tracked as **`CVE-2025-59969`**, allows an attacker to send crafted multicast packets that cause the `evo-aftmand` and `evo-pfemand` processes to crash and restart, disrupting forwarding-related functions on affected devices. A second vulnerability, **`CVE-2026-33783`**, affects PTX systems where **SR-TE tunnels provisioned via PCEP** are present; under those conditions, specific **gRPC** queries can trigger a crash in the `evo-aftman` process. Together, the advisories describe service instability risks in carrier-grade routing platforms, with crashes tied to malformed network traffic and management-plane queries rather than code execution.
Apr 9, 2026