CVE-2017-10621 Junos OS: Denial of service vulnerability in telnetd

Medium 5.3 Published 13 Oct 2017 Updated 16 Sep 2024

Remote unauthenticated attackers can cause a denial of service in the telnetd service on Juniper Networks Junos OS devices.

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-2017-10621?

CVE-2017-10621 is a medium-severity denial of service vulnerability in Juniper Junos, published on 13 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A denial of service vulnerability in telnetd service on Juniper Networks Junos OS allows remote unauthenticated attackers to cause a denial of service. Affected Junos OS releases are: 12.1X46 prior to 12.1X46-D71; 12.3X48 prior to 12.3X48-D50; 14.1 prior to 14.1R8-S5, 14.1R9; 14.1X53 prior to 14.1X53-D50; 14.2 prior to 14.2R7-S9, 14.2R8; 15.1 prior to 15.1F2-S16, 15.1F5-S7, 15.1F6-S6, 15.1R5-S2, 15.1R6; 15.1X49 prior to 15.1X49-D90; 15.1X53 prior to 15.1X53-D47; 16.1 prior to 16.1R4-S1, 16.1R5; 16.2 prior to 16.2R1-S3, 16.2R2;

Weakness: CWE-400

Which versions are affected by CVE-2017-10621?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2017-10621?

No fix has been published for CVE-2017-10621 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-2017-10621 being exploited?

There is no known exploitation of CVE-2017-10621 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-qcrj-f7hq-vcc3.