CVE-2023-44178

Sustained denial of service via CLI overflow

Published Oct 12, 2023 · Updated Sep 18, 2024

A stack-based buffer overflow in Juniper Networks Junos OS CLI processing allows local users with low privileges to interrupt service. Juniper has not disclosed which CLI command is affected or which unchecked operation writes beyond the stack buffer. Repeated execution of the specific command sustains the denial of service, and access to the authenticated CLI is required.

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

A stack-based buffer overflow in Juniper Networks Junos OS CLI processing allows local users with low privileges to interrupt service. Juniper has not disclosed which CLI command is affected or which unchecked operation writes beyond the stack buffer. Repeated execution of the specific command sustains the denial of service, and access to the authenticated CLI is required.

The record

CVE
CVE-2023-44178
Published
Oct 12, 2023
Updated
Sep 18, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-787, CWE-121, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <19.1R3-S10
  2. Affected versionversion=19.2 <19.2R3-S7
  3. Affected versionversion=19.3 <19.3R3-S8
  4. Affected versionversion=19.4 <19.4R3-S12
  5. Affected versionversion=20.2 <20.2R3-S8
  6. Affected versionversion=20.4 <20.4R3-S8
  7. Affected versionversion=21.2 <21.2R3-S6
  8. Affected versionversion=21.3 <21.3R3-S5
  9. Affected versionversion=21.4 <21.4R3-S5
  10. Affected versionversion=22.1 <22.1R3-S3
  11. Affected versionversion=22.2 <22.2R3-S2
  12. Affected versionversion=22.3 <22.3R3-S1
  13. Affected versionversion=22.4 <22.4R2-S1
  14. Affected versionversion=23.2 <23.2R2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

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-S5; version=22.1 <22.1R3-S3; version=22.2 <22.2R3-S2; version=22.3 <22.3R3-S1; version=22.4 <22.4R2-S1; version=23.2 <23.2R2

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-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
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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