CVE-2017-2340 Denial of service in Junos OS on M/MX platforms where Enhanced Subscriber Management for DHCPv6 subscribers is configured
Attackers can cause a Packet Forwarding Engine crash on Juniper M/MX routers by sending crafted IPv6 ND packets when Enhanced Subscriber Management is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-2340?
CVE-2017-2340 is a medium-severity denial of service vulnerability in Juniper Junos, published on 24 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
On Juniper Networks Junos OS 15.1 releases from 15.1R3 to 15.1R4, 16.1 prior to 16.1R3, on M/MX platforms where Enhanced Subscriber Management for DHCPv6 subscribers is configured, a vulnerability in processing IPv6 ND packets originating from subscribers and destined to M/MX series routers can result in a PFE (Packet Forwarding Engine) hang or crash.
Weakness: CWE-20
Which versions are affected by CVE-2017-2340?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2017-2340?
No fix has been published for CVE-2017-2340 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-2340 being exploited?
There is no known exploitation of CVE-2017-2340 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos
- CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification
- CVE-2020-1631 Juniper Junos OS Path Traversal
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization
- CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification
Sources
Also known as GHSA-52f2-j43x-hh76.