Improper validation of syntactic correctness of input in Juniper Junos OS

1) Improper validation of syntactic correctness of input

EUVDB-ID: #VU85271

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-21595

CWE-ID: CWE-1286 - Improper Validation of Syntactic Correctness of Input

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation of syntactic correctness of input error in the Packet Forwarding Engine (PFE). A remote non-authenticated attacker can cause a Denial of Service (DoS).

If an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive.

A manual restart will be required to recover the device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.4R1 - 23.2R1-S2

External links

http://supportportal.juniper.net/s/article/2024-01-Security-Bulletin-Junos-OS-EX4100-EX4400-EX4600-and-QFX5000-Series-A-high-rate-of-specific-ICMP-traffic-will-cause-the-PFE-to-hang-CVE-2024-21595

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.