CVE-2020-1609

Unauthenticated root command execution via JDHCPD stack overflow

Published Jan 15, 2020 · Updated Sep 16, 2024

Stack-based buffer overflow in IPv6 JDHCPD on Junos OS and Junos OS Evolved allows adjacent attackers to execute commands as root. Juniper identifies a stack-based buffer overflow but does not disclose the affected function, field, or missing bounds check. Reachability requires IPv6 JDHCPD relay mode; local-server mode and Junos OS before 15.1 are unaffected, while exploitation grants root control.

CVSS severity8.8
High
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in IPv6 JDHCPD on Junos OS and Junos OS Evolved allows adjacent attackers to execute commands as root. Juniper identifies a stack-based buffer overflow but does not disclose the affected function, field, or missing bounds check. Reachability requires IPv6 JDHCPD relay mode; local-server mode and Junos OS before 15.1 are unaffected, while exploitation grants root control.

The record

CVE
CVE-2020-1609
Published
Jan 15, 2020
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-78, CWE-121, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <19.3R1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=unspecified <19.3R1
Juniper Networks · Junos OSversion=15.1 <15.1R7-S6; version=15.1X49 <15.1X49-D200; version=15.1X53 <15.1X53-D592; version=16.1 <16.1R7-S6; version=16.2 <16.2R2-S11; version=17.1 <17.1R2-S11, 17.1R3-S1; version=17.2 <17.2R2-S8, 17.2R3-S3; version=17.3 <17.3R3-S6; version=17.4 <17.4R2-S7, 17.4R3; version=18.1 <18.1R3-S8; version=18.2 <18.2R3-S2; version=18.2X75 <18.2X75-D60; version=18.3 <18.3R1-S6, 18.3R2-S2, 18.3R3; version=18.4 <18.4R1-S5, 18.4R2-S3, 18.4R3; version=19.1 <19.1R1-S3, 19.1R2; version=19.2 <19.2R1-S3, 19.2R2; version=19.3 <19.3R1, 19.3R2

Published CVSS scores

8.8Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3NIST NVDAV:A/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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