Junos OS Evolved: A high rate of specific traffic will cause a complete system outage
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 20.4R3-S7-EVO, 21.4R3-S5-EVO, 22.1R3-S2-EVO, 22.2R3-EVO, 22.3R2-EVO, and 1 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 Allocation of Resources Without Limits or Throttling vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). If a high rate of specific valid packets are processed by the routing engine (RE) this will lead to a loss of connectivity of the RE with other components of the chassis and thereby a complete and persistent system outage. Please note that a carefully designed lo0 firewall filter will block or limit these packets which should prevent this issue from occurring. The following log messages can be seen when this issue occurs: <host> kernel: nf_conntrack: nf_conntrack: table full, dropping packet This issue affects Juniper Networks Junos OS Evolved: • All versions earlier than 20.4R3-S7-EVO; • 21.2R1-EVO and later versions; • 21.4-EVO versions earlier than 21.4R3-S5-EVO; • 22.1-EVO versions earlier than 22.1R3-S2-EVO; • 22.2-EVO versions earlier than 22.2R3-EVO; • 22.3-EVO versions earlier than 22.3R2-EVO; • 22.4-EVO versions earlier than 22.4R2-EVO.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Juniper Networks Junos OS Evolved
fixed in 20.4R3-S7-EVO; From 21.2-EVO; From 21.4-EVO · fixed in 21.4R3-S5-EVO; From 22.1-EVO · fixed in 22.1R3-S2-EVO; From 22.2-EVO · fixed in 22.2R3-EVO; From 22.3-EVO · fixed in 22.3R2-EVO; From 22.4-EVO · fixed in 22.4R2-EVO