CVE-2023-44177

Service interruption via CLI stack overflow

Published Oct 12, 2023 · Updated Sep 19, 2024

Stack-based buffer overflow in the CLI of Juniper Networks Junos OS and Junos OS Evolved allows local users to interrupt service. A specific CLI command writes beyond a stack buffer; Juniper has not publicly identified the command, input field, or affected process. Low-privileged CLI access is required, and repeated commands sustain the denial of service without reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.16%
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 the CLI of Juniper Networks Junos OS and Junos OS Evolved allows local users to interrupt service. A specific CLI command writes beyond a stack buffer; Juniper has not publicly identified the command, input field, or affected process. Low-privileged CLI access is required, and repeated commands sustain the denial of service without reported confidentiality or integrity impact.

The record

CVE
CVE-2023-44177
Published
Oct 12, 2023
Updated
Sep 19, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-121, CWE-787, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <20.4R3-S8-EVO
  2. Affected versionversion=21.2 <21.2R3-S6-EVO
  3. Affected versionversion=21.3 <21.3R3-S5-EVO
  4. Affected versionversion=21.4 <21.4R3-S4-EVO
  5. Affected versionversion=22.1 <22.1R3-S3-EVO
  6. Affected versionversion=22.2 <22.2R3-S1-EVO
  7. Affected versionversion=22.3 <22.3R3-EVO
  8. Affected versionversion=22.4 <22.4R2-EVO

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <20.4R3-S8-EVO; version=21.2 <21.2R3-S6-EVO; version=21.3 <21.3R3-S5-EVO; version=21.4 <21.4R3-S4-EVO; version=22.1 <22.1R3-S3-EVO; version=22.2 <22.2R3-S1-EVO; version=22.3 <22.3R3-EVO; version=22.4 <22.4R2-EVO
Juniper Networks · Junos OSversion=0 <19.1R3-S10; version=19.2 <19.2R3-S7; version=19.3 <19.3R3-S8; version=19.4 <19.4R3-S12; version=20.2 <20.2R3-S8; version=20.4 <20.4R3-S8; version=21.2 <21.2R3-S6; version=21.3 <21.3R3-S5; version=21.4 <21.4R3-S4; version=22.1 <22.1R3-S3; version=22.2 <22.2R3-S1; version=22.3 <22.3R3; version=22.4 <22.4R2

Published CVSS scores

5.5Juniper NetworksCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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