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CVE
PUBLISHED

CVE-2024-39542

Junos OS and Junos OS Evolved: A malformed CFM packet or specific transit traffic leads to FPC crash

Assignerjuniper
Reserved2024-06-25
Published2024-07-11
Updated2024-07-12

Description

An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with MPC10/11 or LC9600, MX304, and Junos OS Evolved on ACX Series and PTX Series allows an unauthenticated, network based attacker to cause a Denial-of-Service (DoS). This issue can occur in two scenarios: 1. If a device, which is configured with SFLOW and ECMP, receives specific valid transit traffic, which is subject to sampling, the packetio process crashes, which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. (This scenario is only applicable to PTX but not to ACX or MX.) 2. If a device receives a malformed CFM packet on an interface configured with CFM, the packetio process crashes, which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. Please note that the CVSS score is for the formally more severe issue 1. The CVSS score for scenario 2. is: 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) This issue affects Junos OS: * All versions before 21.2R3-S4, * 21.4 versions before 21.4R2, * 22.2 versions before 22.2R3-S2;  Junos OS Evolved: * All versions before 21.2R3-S8-EVO, * 21.4 versions before 21.4R2-EVO.



HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

Problem types

1286 Improper Validation of Syntactic Correctness of Input

Product status

Default status
unaffected

Any version before 21.2R3-S4
affected

21.4 before 21.4R2
affected

22.2 before 22.2R2-S1, 22.2R3
affected

Default status
unaffected

Any version before 21.2R3-S8-EVO
affected

21.4 before 21.4R2-EVO
affected

References

https://supportportal.juniper.net/JSA83002 vendor-advisory

cve.org CVE-2024-39542

nvd.nist.gov CVE-2024-39542

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