CVE-2026-33782
Severity CVSS v4.0:
HIGH
Type:
Unavailable / Other
Publication date:
09/04/2026
Last modified:
09/04/2026
Description
A Missing Release of Memory after Effective Lifetime vulnerability in the DHCP daemon (jdhcpd) of Juniper Networks Junos OS on MX Series, allows an adjacent, unauthenticated attacker to cause a memory leak, that will eventually cause a complete Denial-of-Service (DoS).<br />
<br />
In a DHCPv6 over PPPoE, or DHCPv6 over VLAN with Active lease query or Bulk lease query scenario, every subscriber logout will leak a small amount of memory. When all available memory has been exhausted, jdhcpd will crash and restart which causes a complete service impact until the process has recovered.<br />
<br />
The memory usage of jdhcpd can be monitored with:<br />
<br />
user@host> show system processes extensive | match jdhcpd<br />
<br />
<br />
<br />
This issue affects Junos OS:<br />
<br />
* all versions before 22.4R3-S1,<br />
* 23.2 versions before 23.2R2,<br />
* 23.4 versions before 23.4R2.
Impact
Base Score 4.0
8.70
Severity 4.0
HIGH
Base Score 3.x
6.50
Severity 3.x
MEDIUM