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CVE

CVE-2021-0224

A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote a

A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12.

17.4 versions prior to 17.4R2-S13.

18.1 versions prior to 18.1R3-S13.

18.2 versions prior to 18.2R3-S8.

18.3 versions prior to 18.3R3-S5.

18.4 versions prior to 18.4R1-S8, 18.4R3-S8.

19.1 versions prior to 19.1R3-S4.

19.2 versions prior to 19.2R3-S2.

19.3 versions prior to 19.3R3-S1.

19.4 versions prior to 19.4R3-S1.

20.1 versions prior to 20.1R2.

20.2 versions prior to 20.2R2.

20.3 versions prior to 20.3R2.

MEDIUM · CVSS 6.5 EPSS 0.00081
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-770Allocation of Resources Without Limits or Throttling
CWE-770Allocation of Resources Without Limits or Throttling
▤

Affected Products & Versions

1
juniper junosall versions
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · sirt@juniper.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Apr 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kb.juniper.net/JSA11119Vendor Advisory
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