CVE-2024-21617

Service interruption via unreclaimed BGP flap memory

Published Jan 12, 2024 · Updated Jun 17, 2025

Incomplete cleanup in affected Junos OS 21.2 through 22.4 releases allows attackers to exhaust memory through BGP flaps when NSR is enabled. NSR handling fails to release memory after a BGP flap, so each routing change adds unreclaimed usage. An attacker adjacent to a BGP peer can progressively exhaust memory and interrupt services; SRX Series devices are unaffected.

CVSS severity6.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incomplete cleanup in affected Junos OS 21.2 through 22.4 releases allows attackers to exhaust memory through BGP flaps when NSR is enabled. NSR handling fails to release memory after a BGP flap, so each routing change adds unreclaimed usage. An attacker adjacent to a BGP peer can progressively exhaust memory and interrupt services; SRX Series devices are unaffected.

The record

CVE
CVE-2024-21617
Published
Jan 12, 2024
Updated
Jun 17, 2025
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-459, T1499.002
Attack vector
adjacent
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=21.2 <21.2R3-S5
  2. Affected versionversion=21.3 <21.3R3-S4
  3. Affected versionversion=21.4 <21.4R3-S4
  4. Affected versionversion=22.1 <22.1R3-S2
  5. Affected versionversion=22.2 <22.2R3-S2
  6. Affected versionversion=22.3 <22.3R2-S1, 22.3R3
  7. Affected versionversion=22.4 <22.4R1-S2, 22.4R2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=21.2 <21.2R3-S5; version=21.3 <21.3R3-S4; version=21.4 <21.4R3-S4; version=22.1 <22.1R3-S2; version=22.2 <22.2R3-S2; version=22.3 <22.3R2-S1, 22.3R3; version=22.4 <22.4R1-S2, 22.4R2

Published CVSS scores

6.5Juniper NetworksCVSS:3.1/AV:A/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
T1499.002Endpoint Denial of Service: Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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