Juniper Junos MX Series PFE Small Packet DoS (JSA11036)

Medium Nessus Plugin ID 138908


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 small fragments requiring reassembly. By continuously sending fragmented packets that cannot be reassembled, an attacker can repeatedly disable the PFE causing a sustained 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 JSA11036

See Also

Plugin Details

Severity: Medium

ID: 138908

File Name: juniper_jsa11036.nasl

Version: 1.6

Type: combined

Published: 2020/07/24

Updated: 2020/07/31

Dependencies: 55932

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2020-1649

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: 7.5

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

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-2020-1649

JSA: JSA11036

IAVA: 2020-A-0320