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High severity7.5NVD Advisory· Published Apr 22, 2021· Updated Jun 17, 2026

CVE-2021-0233

CVE-2021-0233

Description

A vulnerability in Juniper Networks Junos OS ACX500 Series, ACX4000 Series, may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a Forwarding Engine Board (FFEB) crash. Continued receipt of these packets will sustain the Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on ACX500 Series, ACX4000 Series: 17.4 versions prior to 17.4R3-S2.

Affected products

25
  • Juniper Networks/Junos25 versions
    cpe:2.3:o:juniper:junos:17.4:-:*:*:*:*:*:*+ 24 more
    • cpe:2.3:o:juniper:junos:17.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s10:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s11:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s8:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s9:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3:*:*:*:*:*:*
    • (no CPE)range: 17.4 versions prior to 17.4R3-S2
    • (no CPE)range: 17.4

Patches

Vulnerability mechanics

References

1

News mentions

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