CVE-2021-31360

Root file overwrite via low-privilege CLI operations

Published Oct 19, 2021 · Updated Sep 17, 2024

Improper privilege management in Juniper Networks Junos OS and Junos OS Evolved allows local users to overwrite files as root via the CLI. The CLI performs a low-privilege user's selected local file overwrite with root authority; Juniper has not disclosed the affected command or selection path. Reachability requires a low-privilege CLI account and a running jdhcpd process; overwriting critical files can corrupt system state or cause sustained service interruption requiring manual recovery.

CVSS severity7.1
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in Juniper Networks Junos OS and Junos OS Evolved allows local users to overwrite files as root via the CLI. The CLI performs a low-privilege user's selected local file overwrite with root authority; Juniper has not disclosed the affected command or selection path. Reachability requires a low-privilege CLI account and a running jdhcpd process; overwriting critical files can corrupt system state or cause sustained service interruption requiring manual recovery.

The record

CVE
CVE-2021-31360
Published
Oct 19, 2021
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-269, CWE-20, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=21.1R1-EVO <21.1*
  2. Affected versionversion=unspecified <20.4R2-S3-EVO

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.1R1-EVO <21.1*; version=unspecified <20.4R2-S3-EVO
Juniper Networks · Junos OSversion=15.1 <15.1R7-S10; version=17.4 <17.4R3-S5; version=18.3 <18.3R3-S5; version=18.4 <18.4R3-S9; version=19.1 <19.1R3-S6; version=19.2 <19.2R1-S7, 19.2R3-S3; version=19.3 <19.3R2-S6, 19.3R3-S3; version=19.4 <19.4R3-S6; version=20.1 <20.1R2-S2, 20.1R3-S1; version=20.2 <20.2R3-S2; version=20.3 <20.3R3; version=20.4 <20.4R2-S1, 20.4R3; version=21.1 <21.1R1-S1, 21.1R2

Published CVSS scores

6.6NISTAV:L/AC:L/Au:N/C:N/I:C/A:C
7.1NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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