high
7.5
CWE
476
Advisory Published
Updated

CVE-2021-0206: Junos OS: NFX Series, SRX Series: PFE may crash upon receipt of specific packet when SSL Proxy is configured.

First published: Fri Jan 15 2021(Updated: )

A NULL Pointer Dereference vulnerability in Juniper Networks Junos OS allows an attacker to send a specific packet causing the packet forwarding engine (PFE) to crash and restart, resulting in a Denial of Service (DoS). By continuously sending these specific packets, an attacker can repeatedly disable the PFE causing a sustained Denial of Service (DoS). This issue only affects Juniper Networks NFX Series, SRX Series platforms when SSL Proxy is configured. 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. This issue does not affect Juniper Networks Junos OS versions on NFX Series and SRX Series prior to 18.3R1.

Credit: sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Juniper JUNOS=18.3
Juniper JUNOS=18.3-r1
Juniper JUNOS=18.3-r1-s1
Juniper JUNOS=18.3-r1-s2
Juniper JUNOS=18.3-r1-s3
Juniper JUNOS=18.3-r1-s5
Juniper JUNOS=18.3-r1-s6
Juniper JUNOS=18.3-r2
Juniper JUNOS=18.3-r2-s1
Juniper JUNOS=18.3-r2-s2
Juniper JUNOS=18.3-r2-s3
Juniper JUNOS=18.3-r2-s4
Juniper JUNOS=18.3-r3
Juniper JUNOS=18.3-r3-s1
Juniper JUNOS=18.3-r3-s2
Juniper JUNOS=18.3-r3-s3
Juniper JUNOS=18.4
Juniper JUNOS=18.4-r1
Juniper JUNOS=18.4-r1-s1
Juniper JUNOS=18.4-r1-s2
Juniper JUNOS=18.4-r1-s5
Juniper JUNOS=18.4-r1-s6
Juniper JUNOS=18.4-r2
Juniper JUNOS=18.4-r2-s1
Juniper JUNOS=18.4-r2-s2
Juniper JUNOS=18.4-r2-s3
Juniper JUNOS=18.4-r2-s4
Juniper JUNOS=18.4-r3
Juniper JUNOS=19.1
Juniper JUNOS=19.1-r1
Juniper JUNOS=19.1-r1-s1
Juniper JUNOS=19.1-r1-s2
Juniper JUNOS=19.1-r1-s3
Juniper JUNOS=19.1-r1-s4
Juniper JUNOS=19.1-r1-s5
Juniper JUNOS=19.1-r2
Juniper JUNOS=19.1-r2-s1
Juniper JUNOS=19.2
Juniper JUNOS=19.2-r1
Juniper JUNOS=19.2-r1-s1
Juniper JUNOS=19.3
Juniper JUNOS=19.3-r1
Juniper JUNOS=19.3-r1-s1
Juniper Nfx150
Juniper Nfx250
Juniper Nfx350
Juniper Srx1500
Juniper Srx300
Juniper Srx320
Juniper Srx340
Juniper Srx345
Juniper Srx380
Juniper Srx4100
Juniper Srx4200
Juniper Srx4600
Juniper Srx5400
Juniper Srx550
Juniper Srx5600
Juniper Srx5800

Remedy

The following software releases have been updated to resolve this specific issue: Junos OS: 18.3R3-S4, 18.4R3-S1, 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2R1-S2, 19.2R2, 19.3R2, 19.4R1 and all subsequent releases.

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-0206?

    CVE-2021-0206 is a NULL Pointer Dereference vulnerability in Juniper Networks Junos OS that allows an attacker to send a specific packet causing the packet forwarding engine (PFE) to crash and restart, resulting in a Denial of Service (DoS).

  • Which Juniper Networks Junos OS versions are affected by CVE-2021-0206?

    Juniper Networks Junos OS versions 18.3 to 19.3 are affected by CVE-2021-0206.

  • What is the severity of CVE-2021-0206?

    CVE-2021-0206 has a severity rating of 7.5 (High).

  • How can I fix CVE-2021-0206?

    To fix CVE-2021-0206, it is recommended to upgrade Juniper Networks Junos OS to a non-vulnerable version as mentioned in the Juniper advisory.

  • Where can I find more information about CVE-2021-0206?

    You can find more information about CVE-2021-0206 in the Juniper Networks security advisory: https://kb.juniper.net/JSA11096

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