Junos OS and Junos OS Evolved: cRPD: Receipt of crafted TCP traffic can trigger high CPU utilization
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 21.2R3-S8, 21.4R3-S7, 22.1R3-S6, 22.2R3-S4, 22.3R3-S3, and 8 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
An Improper Handling of Exceptional Conditions vulnerability in the rpd-server of Juniper Networks Junos OS and Junos OS Evolved within cRPD allows an unauthenticated network-based attacker sending crafted TCP traffic to the routing engine (RE) to cause a CPU-based Denial of Service (DoS). If specially crafted TCP traffic is received by the control plane, or a TCP session terminates unexpectedly, it will cause increased control plane CPU utilization by the rpd-server process. While not explicitly required, the impact is more severe when RIB sharding is enabled. Task accounting shows unexpected reads by the RPD Server jobs for shards: user@junos> show task accounting detail ... read:RPD Server.0.0.0.0+780.192.168.0.78+48886 TOT:00000003.00379787 MAX:00000000.00080516 RUNS: 233888\ read:RPD Server.0.0.0.0+780.192.168.0.78+49144 TOT:00000004.00007565 MAX:00000000.00080360 RUNS: 233888\ read:RPD Server.0.0.0.0+780.192.168.0.78+49694 TOT:00000003.00600584 MAX:00000000.00080463 RUNS: 233888\ read:RPD Server.0.0.0.0+780.192.168.0.78+50246 TOT:00000004.00346998 MAX:00000000.00080338 RUNS: 233888\ This issue affects: Junos OS with cRPD: • All versions before 21.2R3-S8, • 21.4 before 21.4R3-S7, • 22.1 before 22.1R3-S6, • 22.2 before 22.2R3-S4, • 22.3 before 22.3R3-S3, • 22.4 before 22.4R3-S2, • 23.2 before 23.2R2-S2, • 24.2 before 24.2R2; Junos OS Evolved with cRPD: • All versions before 21.4R3-S7-EVO, • 22.2 before 22.2R3-S4-EVO, • 22.3 before 22.3R3-S3-EVO, • 22.4 before 22.4R3-S2-EVO, • 23.2 before 23.2R2-EVO.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Juniper Networks Junos OS
fixed in 21.2R3-S8; From 21.4 · fixed in 21.4R3-S7; From 22.1 · fixed in 22.1R3-S6; From 22.2 · fixed in 22.2R3-S4; From 22.3 · fixed in 22.3R3-S3; From 22.4 · fixed in 22.4R3-S2; From 23.2 · fixed in 23.2R2-S2; From 24.2 · fixed in 24.2R2
- Juniper Networks Junos OS Evolved
fixed in 21.4R3-S7-EVO; From 22.2-EVO · fixed in 22.2R3-S4-EVO; From 22.3-EVO · fixed in 22.3R3-S3-EVO; From 22.4-EVO · fixed in 22.4R3-S2-EVO; From 23.2-EVO · fixed in 23.2R2-EVO