Vulnerability identifier: #VU82433

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-2020-1603

CWE-ID: CWE-401

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 non-authenticated attacker to a crash the entire system.

Specific IPv6 packets sent by clients processed by the Routing Engine (RE) are improperly handled. These IPv6 packets are designed to be blocked by the RE from egressing the RE.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 18.2X75-D5 - 18.2X75-D40, 17.3 - 17.3R2-S5, 17.1 - 17.1R2-S10, 17.2 - 17.2R1-S8, 18.2 - 18.2R3-S1, 19.2 - 19.2R1-S1, 16.1 - 16.1R7-S5, 18.3 - 18.3R1-S5, 18.4 - 18.4R2-S1, 18.4R1-S5, 19.1 - 19.1R1-S2, 19.3, 16.2 - 16.2R2-S10, 18.1 - 18.1R3-S6, 17.4 - 17.4R2-S4

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External links
http://supportportal.juniper.net/s/article/2020-01-Security-Bulletin-Junos-OS-Improper-handling-of-specific-IPv6-packets-sent-by-clients-eventually-kernel-crash-vmcore-the-device-CVE-2020-1603

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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.