CVE-2023-44195

Service interruption via Routing Engine filter bypass

Published Oct 12, 2023 · Updated Sep 17, 2024

Improper endpoint restriction in Junos OS Evolved nsagentd allows remote attackers to interrupt service with packets sent to the RE. The daemon processes packets that firewall filters should discard when those packets reach the Routing Engine, increasing resource consumption and bypassing intended access controls. Exploitation is unauthenticated, requires CVE-2023-44196, and causes limited service interruption plus unauthorized access.

CVSS severity5.4
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper endpoint restriction in Junos OS Evolved nsagentd allows remote attackers to interrupt service with packets sent to the RE. The daemon processes packets that firewall filters should discard when those packets reach the Routing Engine, increasing resource consumption and bypassing intended access controls. Exploitation is unauthenticated, requires CVE-2023-44196, and causes limited service interruption plus unauthorized access.

The record

CVE
CVE-2023-44195
Published
Oct 12, 2023
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-923, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 2023CVE 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

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=21.3-EVO <21.3R3-S5-EVO
  2. Affected versionversion=21.4-EVO <21.4R3-S4-EVO
  3. Affected versionversion=22.1R1-EVO <22.1*-EVO
  4. Affected versionversion=22.2R1-EVO <22.2*-EVO
  5. Affected versionversion=22.3-EVO <22.3R2-S2-EVO, 22.3R3-S1-EVO
  6. Affected versionversion=22.4-EVO <22.4R3-EVO

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.3-EVO <21.3R3-S5-EVO; version=21.4-EVO <21.4R3-S4-EVO; version=22.1R1-EVO <22.1*-EVO; version=22.2R1-EVO <22.2*-EVO; version=22.3-EVO <22.3R2-S2-EVO, 22.3R3-S1-EVO; version=22.4-EVO <22.4R3-EVO

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.4Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-923Improper Restriction of Communication Channel to Intended Endpoints
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo