Junos OS: Privilege escalation vulnerability in dual REs, VC or HA cluster may allow unauthorized configuration change.

Description

A privilege escalation vulnerability in Juniper Networks Junos OS devices configured with dual Routing Engines (RE), Virtual Chassis (VC) or high-availability cluster may allow a local authenticated low-privileged user with access to the shell to perform unauthorized configuration modification. This issue does not affect Junos OS device with single RE or stand-alone configuration. This issue affects Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S14; 12.3X48 versions prior to 12.3X48-D86, 12.3X48-D90; 14.1X53 versions prior to 14.1X53-D51; 15.1 versions prior to 15.1R7-S6; 15.1X49 versions prior to 15.1X49-D181, 15.1X49-D190; 15.1X53 versions prior to 15.1X53-D592; 16.1 versions prior to 16.1R4-S13, 16.1R7-S6; 16.2 versions prior to 16.2R2-S10; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R1-S9, 17.2R3-S3; 17.3 versions prior to 17.3R3-S6; 17.4 versions prior to 17.4R2-S6, 17.4R3; 18.1 versions prior to 18.1R3-S7; 18.2 versions prior to 18.2R2-S5, 18.2R3-S1; 18.2 versions prior to 18.2X75-D12, 18.2X75-D33, 18.2X75-D420, 18.2X75-D60, 18.2X75-D411; 18.3 versions prior to 18.3R1-S5, 18.3R2-S1, 18.3R3; 18.4 versions prior to 18.4R1-S4, 18.4R2-S1, 18.4R3; 19.1 versions prior to 19.1R1-S2, 19.1R2; 19.2 versions prior to 19.2R1-S1, 19.2R2.

Scores

EPSS (exploitation in 30 days)

0.22% · top 87% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.

Weakness

• CWE-264 Permissions, Privileges, and Access Controls (opens in a new tab)All about CWE-264 and its CVEs
• CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition (opens in a new tab)All about CWE-367 and its CVEs

Affected products

• Juniper Networks · Junos OS

  • affected 12.3 – < 12.3R12-S14
  • affected 12.3X48 – < 12.3X48-D86, 12.3X48-D90
  • affected 14.1X53 – < 14.1X53-D51
  • affected 15.1 – < 15.1R7-S6
  • affected 15.1X49 – < 15.1X49-D181, 15.1X49-D190
  • affected 15.1X53 – < 15.1X53-D592
  • affected 16.1 – < 16.1R4-S13, 16.1R7-S6
  • affected 16.2 – < 16.2R2-S10
  • affected 17.1 – < 17.1R2-S11, 17.1R3-S1
  • affected 17.2 – < 17.2R1-S9, 17.2R3-S3
  • affected 17.3 – < 17.3R3-S6
  • affected 17.4 – < 17.4R2-S6, 17.4R3
  • affected 18.1 – < 18.1R3-S7
  • affected 18.2 – < 18.2R2-S5, 18.2R3-S1
  • affected 18.3 – < 18.3R1-S5, 18.3R2-S1, 18.3R3
  • affected 18.4 – < 18.4R1-S4, 18.4R2-S1, 18.4R3
  • affected 19.1 – < 19.1R1-S2, 19.1R2
  • affected 19.2 – < 19.2R1-S1, 19.2R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.3R12-S14, 12.3X48-D86, 12.3X48-D90, 14.1X53-D51, 15.1R7-S6, 15.1X49-D181, 15.1X49-D190, 15.1X53-D592, 16.1R4-S13, 16.1R7-S6, 16.2R2-S10, 17.1R2-S11, 17.1R3-S1, 17.2R1-S9, 17.2R3-S3, 17.2X75-D110, 17.2X75-D44, 17.3R3-S6, 17.4R2-S6, 17.4R3, 18.1R3-S7, 18.2R2-S5, 18.2R3-S1, 18.2X75-D12, 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D60, 18.3R1-S5, 18.3R1-S6, 18.3R2-S1, 18.3R2-S3, 18.3R3, 18.4R1-S4, 18.4R1-S5, 18.4R2-S1, 18.4R3, 19.1R1-S2, 19.1R2, 19.2R1-S1, 19.2R2, 19.3R1, and all subsequent releases.

Workaround: Disallow unprivileged authenticated users access to Junos shell. Limit shell access to only trusted administrators.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

• https://kb.juniper.net/JSA11010 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2020-1630](https://trackcve.app/badge/CVE-2020-1630.svg)](https://trackcve.app/cve/CVE-2020-1630)

Record last updated 16 Sept 2024, 22:20 UTC.