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AUSCERT External Security Bulletin Redistribution
JSA11207 - 2021-07 Security Bulletin: Junos OS and Junos OS
Evolved: Multiple vulnerabilities in cURL resolved
21 July 2021
AusCERT Security Bulletin Summary
Product: Junos OS
Junos OS Evolved
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2020-8286 CVE-2020-8285 CVE-2020-8284
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2021-07 Security Bulletin: Junos OS and Junos OS Evolved: Multiple vulnerabilities in cURL resolved
Article ID : JSA11207
Last Updated: 20 Jul 2021
Version : 3.0
These issues affect all versions of Junos OS and Junos OS Evolved.
Multiple vulnerabilities have been resolved in Juniper Networks Junos OS and
Junos OS Evolved by updating cURL third party software. These vulnerabilities
may allow an attacker who tricks an administrator with access to the CLI to
reference a malicious URL, to expose information, or cause a Denial of Service
This issue affects:
Juniper Networks Junos OS:
o all versions prior to 15.1R7-S9;
o 17.3 versions prior to 17.3R3-S12;
o 17.4 versions prior to 17.4R3-S5;
o 18.1 versions prior to 18.1R3-S13;
o 18.2 version 18.2R1 and later versions;
o 18.3 versions prior to 18.3R3-S5;
o 18.4 versions prior to 18.4R2-S9, 18.4R3-S9;
o 19.1 versions prior to 19.1R3-S5;
o 19.2 versions prior to 19.2R3-S2;
o 19.3 versions prior to 19.3R2-S6, 19.3R3-S2;
o 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3;
o 20.1 versions prior to 20.1R2-S2, 20.1R3;
o 20.2 versions prior to 20.2R2-S3, 20.2R3;
o 20.3 versions prior to 20.3R2;
o 20.4 versions prior to 20.4R1-S1, 20.4R2.
Juniper Networks Junos OS Evolved versions prior to 20.4R2-EVO.
This issue was discovered during external security research.
Security issues resolved include:
CVE CVSS Summary
A malicious server can use the FTP PASV response
3.7 ( CVSS:3.1 to trick curl 7.73.0 and earlier into connecting
/AV:N/AC:H/ back to a given IP address and port, and this way
CVE-2020-8284 PR:N/UI:N/S:U/ potentially make curl extract information about
C:L/I:N/A:N ) services that are otherwise private and not
disclosed, for example doing port scanning and
service banner extractions.
7.5 ( CVSS:3.1 curl 7.41.0 through 7.73.0 is vulnerable to an
CVE-2020-8286 /AV:N/AC:L/ improper check for certificate revocation due to
PR:N/UI:N/S:U/ insufficient verification of the OCSP response.
7.5 ( CVSS:3.1 curl 7.21.0 to and including 7.73.0 is vulnerable
CVE-2020-8285 /AV:N/AC:L/ to uncontrolled recursion due to a stack overflow
PR:N/UI:N/S:U/ issue in FTP wildcard match parsing.
The following software releases have been updated to resolve these specific
Junos OS 15.1R7-S9, 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R2-S9*,
18.4R3-S9*, 19.1R3-S5, 19.2R3-S2, 19.3R2-S6, 19.3R3-S2, 19.4R1-S4, 19.4R2-S4,
19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R1-S1, 20.4R2,
21.1R1, and all subsequent releases.
Junos OS Evolved 20.4R2-EVO, 21.1R1-EVO, and all subsequent releases.
This issue is being tracked as 1575921 and 1562153 .
Use access lists or firewall filters to limit access to the device via CLI only
from trusted hosts and administrators.
Software releases or updates are available for download at https://
2021-07-14: Initial Publication.
2021-07-20: Updated PRODUCT AFFECTED field to match PROBLEM text.
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
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