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High severity7.5NVD Advisory· Published Jan 15, 2021· Updated Jun 17, 2026

CVE-2021-0206

CVE-2021-0206

Description

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.

Affected products

47
  • Juniper Networks/Junos45 versions
    cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:*+ 44 more
    • cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r1-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r1-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
    • (no CPE)range: 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
    • (no CPE)range: 18.3R1
  • Juniper Networks/NFX Seriesllm-fuzzy
    Range: 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
  • Juniper Networks/SRX Seriesllm-fuzzy
    Range: 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

Patches

Vulnerability mechanics

References

1

News mentions

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