CVE-2024-21611Network attack vector

rpd restart via unreleased socket-input memory

Published Jan 12, 2024 · Updated Jun 17, 2025

Memory leakage in rpd in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to crash and restart rpd. The daemon fails to release socket-input memory when BGP route churn updates next hops, causing allocations to accumulate until rpd restarts. The attack requires no authentication but only applies when jflow is configured with version-ipfix or version9, and it interrupts routing-protocol service.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in rpd in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to crash and restart rpd. The daemon fails to release socket-input memory when BGP route churn updates next hops, causing allocations to accumulate until rpd restarts. The attack requires no authentication but only applies when jflow is configured with version-ipfix or version9, and it interrupts routing-protocol service.

The record

CVE
CVE-2024-21611
Published
Jan 12, 2024
Updated
Jun 17, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record 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=21.4-EVO <21.4R3-EVO
  2. Affected versionversion=22.1-EVO <22.1R3-EVO
  3. Affected versionversion=22.2-EVO <22.2R3-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.4-EVO <21.4R3-EVO; version=22.1-EVO <22.1R3-EVO; version=22.2-EVO <22.2R3-EVO
Juniper Networks · Junos OSversion=21.4 <21.4R3; version=22.1 <22.1R3; version=22.2 <22.2R3

Published CVSS scores

7.5Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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