Unauthenticated DoS via rpd route-flap race
Published Oct 18, 2022 · Updated May 12, 2025
A TOCTOU race in Juniper Networks Junos OS before 21.3R2 lets remote attackers with an established BGP session crash rpd via flapping BGP routes. The rpd daemon checks and uses contributing BGP multipath routes across unsynchronized route-flap events, creating a timing race that can terminate the process. Exploitation requires BGP multipath with a rapidly flapping contributing route, and crash timing is not directly controllable by the attacker, resulting in a denial of service.
Summary
What happened
A TOCTOU race in Juniper Networks Junos OS before 21.3R2 lets remote attackers with an established BGP session crash rpd via flapping BGP routes. The rpd daemon checks and uses contributing BGP multipath routes across unsynchronized route-flap events, creating a timing race that can terminate the process. Exploitation requires BGP multipath with a rapidly flapping contributing route, and crash timing is not directly controllable by the attacker, resulting in a denial of service.
The record
- CVE
- CVE-2022-22225
- Published
- Oct 18, 2022
- Updated
- May 12, 2025
- Vendor
- Juniper Networks
- Product
- Junos OS Evolved
- Classifications
- CWE-367, T1498
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 18, 2022CVE publishedPublication date reported by the CVE source.
- May 12, 2025Record 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.
- Affected versionversion=21.1R1-EVO <21.1-EVO*
- Affected versionversion=21.2-EVO <21.2R2-EVO
- Affected versionversion=21.3-EVO <21.3R2-EVO
- Affected versionversion=unspecified <20.4R3-S4-EVO
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
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