Junos OS and Junos OS Evolved: In a EVPN-VXLAN scenario state changes on adjacent systems can cause an l2ald process crash
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S4, 22.1R3-S3, and 11 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: no
- Technical impact: partial
Summary
A Use-After-Free vulnerability in the Layer 2 Address Learning Daemon (l2ald) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause l2ald to crash leading to a Denial-of-Service (DoS). In an EVPN-VXLAN scenario, when state updates are received and processed by the affected system, the correct order of some processing steps is not ensured, which can lead to an l2ald crash and restart. Whether the crash occurs depends on system internal timing which is outside the attackers control. This issue affects: Junos OS: • All versions before 20.4R3-S8, • 21.2 versions before 21.2R3-S6, • 21.3 versions before 21.3R3-S5, • 21.4 versions before 21.4R3-S4, • 22.1 versions before 22.1R3-S3, • 22.2 versions before 22.2R3-S1, • 22.3 versions before 22.3R3,, • 22.4 versions before 22.4R2; Junos OS Evolved: • All versions before 20.4R3-S8-EVO, • 21.2-EVO versions before 21.2R3-S6-EVO, • 21.3-EVO versions before 21.3R3-S5-EVO, • 21.4-EVO versions before 21.4R3-S4-EVO, • 22.1-EVO versions before 22.1R3-S3-EVO, • 22.2-EVO versions before 22.2R3-S1-EVO, • 22.3-EVO versions before 22.3R3-EVO, • 22.4-EVO versions before 22.4R2-EVO.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Juniper Networks Junos OS
fixed in 20.4R3-S8; From 21.2 · fixed in 21.2R3-S6; From 21.3 · fixed in 21.3R3-S5; From 21.4 · fixed in 21.4R3-S4; From 22.1 · fixed in 22.1R3-S3; From 22.2 · fixed in 22.2R3-S1; From 22.3 · fixed in 22.3R3; From 22.4 · fixed in 22.4R2
- Juniper Networks Junos OS Evolved
fixed in 20.4R3-S8-EVO; From 21.2-EVO · fixed in 21.2R3-S6-EVO; From 21.3-EVO · fixed in 21.3R3-S5-EVO; From 21.4-EVO · fixed in 21.4R3-S4-EVO; From 22.1-EVO · fixed in 22.1R3-S3-EVO; From 22.2-EVO · fixed in 22.2R3-S1-EVO; From 22.3-EVO · fixed in 22.3R3-EVO; From 22.4-EVO · fixed in 22.4R2-EVO