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Vulnerability Details CVE-2021-31366

An Unchecked Return Value vulnerability in the authd (authentication daemon) of Juniper Networks Junos OS on MX Series configured for subscriber management / BBE allows an adjacent attacker to cause a crash by sending a specific username. This impacts authentication, authorization, and accounting (AAA) services on the MX devices and leads to a Denial of Service (DoS) condition. Continued receipted of these PPP login request will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 45.8%
CVSS Severity
CVSS v3 Score 6.5
CVSS v2 Score 3.3
Products affected by CVE-2021-31366
  • Juniper » Mx10003 » Version: N/A
    cpe:2.3:h:juniper:mx10003:-
  • Juniper » Mx10008 » Version: N/A
    cpe:2.3:h:juniper:mx10008:-
  • Juniper » Mx10016 » Version: N/A
    cpe:2.3:h:juniper:mx10016:-
  • Juniper » Mx104 » Version: N/A
    cpe:2.3:h:juniper:mx104:-
  • Juniper » Mx10 » Version: N/A
    cpe:2.3:h:juniper:mx10:-
  • Juniper » Mx150 » Version: N/A
    cpe:2.3:h:juniper:mx150:-
  • Juniper » Mx2008 » Version: N/A
    cpe:2.3:h:juniper:mx2008:-
  • Juniper » Mx2010 » Version: N/A
    cpe:2.3:h:juniper:mx2010:-
  • Juniper » Mx2020 » Version: N/A
    cpe:2.3:h:juniper:mx2020:-
  • Juniper » Mx204 » Version: N/A
    cpe:2.3:h:juniper:mx204:-
  • Juniper » Mx240 » Version: N/A
    cpe:2.3:h:juniper:mx240:-
  • Juniper » Mx40 » Version: N/A
    cpe:2.3:h:juniper:mx40:-
  • Juniper » Mx480 » Version: N/A
    cpe:2.3:h:juniper:mx480:-
  • Juniper » Mx5 » Version: N/A
    cpe:2.3:h:juniper:mx5:-
  • Juniper » Mx80 » Version: N/A
    cpe:2.3:h:juniper:mx80:-
  • Juniper » Mx960 » Version: N/A
    cpe:2.3:h:juniper:mx960:-
  • Juniper » Junos » Version: 15.1
    cpe:2.3:o:juniper:junos:15.1
  • Juniper » Junos » Version: 17.3
    cpe:2.3:o:juniper:junos:17.3
  • Juniper » Junos » Version: 17.4
    cpe:2.3:o:juniper:junos:17.4
  • Juniper » Junos » Version: 18.1
    cpe:2.3:o:juniper:junos:18.1
  • Juniper » Junos » Version: 18.2
    cpe:2.3:o:juniper:junos:18.2
  • Juniper » Junos » Version: 18.3
    cpe:2.3:o:juniper:junos:18.3
  • Juniper » Junos » Version: 18.4
    cpe:2.3:o:juniper:junos:18.4
  • Juniper » Junos » Version: 19.1
    cpe:2.3:o:juniper:junos:19.1
  • Juniper » Junos » Version: 19.2
    cpe:2.3:o:juniper:junos:19.2
  • Juniper » Junos » Version: 19.3
    cpe:2.3:o:juniper:junos:19.3
  • Juniper » Junos » Version: 19.4
    cpe:2.3:o:juniper:junos:19.4
  • Juniper » Junos » Version: 20.1
    cpe:2.3:o:juniper:junos:20.1
  • Juniper » Junos » Version: 20.2
    cpe:2.3:o:juniper:junos:20.2
  • Juniper » Junos » Version: 20.3
    cpe:2.3:o:juniper:junos:20.3
  • Juniper » Junos » Version: 20.4
    cpe:2.3:o:juniper:junos:20.4
  • Juniper » Junos » Version: 21.1
    cpe:2.3:o:juniper:junos:21.1


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