#VU49516 NULL pointer dereference

Published: 2021-01-13

Vulnerability identifier: #VU49516

Vulnerability risk: Medium

CVSSv3: 6.5 [CVSS:3.0/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-2021-0206


Exploitation vector: Network

Exploit availability: No


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

The vulnerability exists due to a NULL pointer dereference error in Juniper Networks Junos OS when SSL Proxy is configured. A remote attacker can send specially crafted packet to the system causing the packet forwarding engine (PFE) to crash and restart


This issue affects Juniper Networks Junos OS on NFX Series and SRX Series:

  • 18.3 versions prior to 18.3R3-S4;
  • 18.4 versions prior to 18.4R3-S1;
  • 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3;
  • 19.2 versions prior to 19.2R1-S2, 19.2R2;
  • 19.3 versions prior to 19.3R2.

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: before 18.3R3-S4, 18.4R3-S1, 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2R1-S2, 19.2R2, 19.3R2, 19.4R1

External links

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.

Latest bulletins with this vulnerability