Vulnerability identifier: #VU49516

Vulnerability 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-2021-0206

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

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

Mitigation

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: 18.3 - 18.3R3-S3, 18.3R2-S3, 18.3R3-S1, 19.1 - 19.1R2-S3, 19.1R1-S4, 18.4 - 18.4R3, 18.4R1-S5, 18.4R2-S3, 19.4, 19.2 - 19.2R1-S9, 19.3 - 19.3R1, 19.3R1-S1, 19.2R1-S4

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11096&cat=SIRT_1&actp=LIST

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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.