Service interruption via TCP MBUF leak
Published Jan 12, 2023 · Updated Apr 7, 2025
Uncontrolled resource consumption in Junos OS TCP processing allows remote attackers to exhaust MBUFs and interrupt service. TCP processing on the Routing Engine fails to release MBUFs for crafted packets addressed to a configured IPv4 or IPv6 interface, allowing the buffer pool to drain. Transit traffic does not trigger the leak; an affected device does not recover automatically and requires a manual restart.
Summary
What happened
Uncontrolled resource consumption in Junos OS TCP processing allows remote attackers to exhaust MBUFs and interrupt service. TCP processing on the Routing Engine fails to release MBUFs for crafted packets addressed to a configured IPv4 or IPv6 interface, allowing the buffer pool to drain. Transit traffic does not trigger the leak; an affected device does not recover automatically and requires a manual restart.
The record
- CVE
- CVE-2023-22396
- Published
- Jan 12, 2023
- Updated
- Apr 7, 2025
- Vendor
- Juniper Networks
- Product
- Junos OS
- Classifications
- CWE-400, T1499.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 12, 2023CVE publishedPublication date reported by the CVE source.
- Apr 7, 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.
- Affected versionversion=12.3R12-S19 <12.3*
- Affected versionversion=15.1R7-S10 <15.1*
- Affected versionversion=17.3R3-S12 <17.3*
- Affected versionversion=18.4R3-S9 <18.4*
- Affected versionversion=19.1R3-S7 <19.1*
- Affected versionversion=19.2R3-S3 <19.2*
- Affected versionversion=19.3R2-S7, 19.3R3-S3 <19.3* changes=[{"at":"19.3R3-S7","status":"unaffected"}]
- Affected versionversion=19.4R2-S7, 19.4R3-S5 <19.4* changes=[{"at":"19.4R3-S10","status":"unaffected"}]
- Affected versionversion=20.1R3-S1 <20.1*
- Affected versionversion=20.2R3-S2 <20.2* changes=[{"at":"20.2R3-S6","status":"unaffected"}]
- Affected versionversion=20.3R3-S1 <20.3* changes=[{"at":"20.3R3-S6","status":"unaffected"}]
- Affected versionversion=20.4R2-S2, 20.4R3 <20.4* changes=[{"at":"20.4R3-S5","status":"unaffected"}]
- Affected versionversion=21.1R2 <21.1* changes=[{"at":"21.1R3-S4","status":"unaffected"}]
- Affected versionversion=21.2R1-S1, 21.2R2 <21.2* changes=[{"at":"21.2R3-S3","status":"unaffected"}]
- Affected versionversion=21.3 <21.3R3-S2
- Affected versionversion=21.4 <21.4R3
- Affected versionversion=22.1 <22.1R2-S1, 22.1R3
- Affected versionversion=22.2 <22.2R1-S2, 22.2R2
- Affected versionversion=22.3 <22.3R1-S1, 22.3R2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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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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