PFE restart via flowd out-of-bounds write
Published Jan 12, 2023 · Updated Apr 7, 2025
Out-of-bounds write in Juniper Networks Junos OS 19.2 through 21.4 allows remote attackers to restart the SRX Series PFE. When Unified Policies inspect a crafted IPv6 packet, a dynamic-application rejection path writes beyond a flowd buffer while forming an ICMP deny response. The path is reachable without authentication only on SRX devices using Unified Policies with IPv6, and each trigger cores flowd and restarts the PFE, interrupting traffic.
Summary
What happened
Out-of-bounds write in Juniper Networks Junos OS 19.2 through 21.4 allows remote attackers to restart the SRX Series PFE. When Unified Policies inspect a crafted IPv6 packet, a dynamic-application rejection path writes beyond a flowd buffer while forming an ICMP deny response. The path is reachable without authentication only on SRX devices using Unified Policies with IPv6, and each trigger cores flowd and restarts the PFE, interrupting traffic.
The record
- CVE
- CVE-2023-22411
- Published
- Jan 12, 2023
- Updated
- Apr 7, 2025
- Vendor
- Juniper Networks
- Product
- Junos OS
- Classifications
- CWE-787, T1499.004
- 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=19.2 <19.2R3-S6
- Affected versionversion=19.3 <19.3R3-S6
- Affected versionversion=19.4 <19.4R3-S9
- Affected versionversion=20.2 <20.2R3-S5
- Affected versionversion=20.3 <20.3R3-S4
- Affected versionversion=20.4 <20.4R3-S3
- Affected versionversion=21.1 <21.1R3
- Affected versionversion=21.2 <21.2R3
- Affected versionversion=21.3 <21.3R2
- Affected versionversion=21.4 <21.4R2
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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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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