Juniper Junos MX Series PFE Large Packet DoS (JSA11041)

Medium Nessus Plugin ID 138907


The remote device is missing a vendor-supplied security patch.


According to its self-reported version, the remote Juniper Junos OS device is affected by a denial of service (DoS) vulnerability. When a device running Juniper Networks Junos OS with MPC7, MPC8, or MPC9 line cards installed and the system is configured for inline IP reassembly, used by L2TP, MAP-E, GRE, and IPIP, the packet forwarding engine (PFE) will become disabled upon receipt of large packets requiring fragmentation. By continuously sending fragmented packets that cannot be reassembled, an unauthenticated, remote attacker can repeatedly disable the PFE causing a DoS.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Apply the relevant Junos software release referenced in Juniper advisory JSA11041

See Also

Plugin Details

Severity: Medium

ID: 138907

File Name: juniper_jsa11041.nasl

Version: 1.3

Type: combined

Published: 2020/07/24

Updated: 2020/07/31

Dependencies: 55932

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2020-1655

CVSS v2.0

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3.0

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vulnerability Information

CPE: cpe:/o:juniper:junos

Required KB Items: Host/Juniper/JUNOS/Version, Host/Juniper/model

Patch Publication Date: 2020/07/08

Vulnerability Publication Date: 2020/07/08

Reference Information

CVE: CVE-2020-1655

JSA: JSA11041

IAVA: 2020-A-0320