Junos OS: EX Series: RPD crash when executing specific "show ospf interface" commands from the CLI with OSPF authentication configured

Description

Execution of the "show ospf interface extensive" or "show ospf interface detail" CLI commands on a Juniper Networks device running Junos OS may cause the routing protocols process (RPD) to crash and restart if OSPF interface authentication is configured, leading to a Denial of Service (DoS). By continuously executing the same CLI commands, a local attacker can repeatedly crash the RPD process causing a sustained Denial of Service. Note: Only systems utilizing ARM processors, found on the EX2300 and EX3400, are vulnerable to this issue. Systems shipped with other processor architectures are not vulnerable to this issue. The processor architecture can be displayed via the 'uname -a' command. For example: ARM (vulnerable): % uname -a | awk '{print $NF}' arm PowerPC (not vulnerable): % uname -a | awk '{print $NF}' powerpc AMD (not vulnerable): % uname -a | awk '{print $NF}' amd64 Intel (not vulnerable): % uname -a | awk '{print $NF}' i386 This issue affects Juniper Networks Junos OS: 12.3X48 versions prior to 12.3X48-D100; 14.1X53 versions prior to 14.1X53-D140, 14.1X53-D54; 15.1 versions prior to 15.1R7-S7; 15.1X49 versions prior to 15.1X49-D210; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S8; 17.1 versions prior to 17.1R2-S12; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S2, 17.4R3; 18.1 versions prior to 18.1R3-S2; 18.2 versions prior to 18.2R2, 18.2R3; 18.2X75 versions prior to 18.2X75-D40; 18.3 versions prior to 18.3R1-S2, 18.3R2.

Timeline

Scores

EPSS (exploitation in 30 days)

0.35% · top 71% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

• CWE-755 Improper Handling of Exceptional Conditions (opens in a new tab)All about CWE-755 and its CVEs

Affected products

• Juniper Networks · Junos OS

  • affected 12.3X48 – < 12.3X48-D100
  • affected 14.1X53 – < 14.1X53-D140, 14.1X53-D54
  • affected 15.1 – < 15.1R7-S7
  • affected 15.1X49 – < 15.1X49-D210
  • affected 15.1X53 – < 15.1X53-D593
  • affected 16.1 – < 16.1R7-S8
  • affected 17.1 – < 17.1R2-S12
  • affected 17.2 – < 17.2R3-S4
  • affected 17.3 – < 17.3R3-S8
  • affected 17.4 – < 17.4R2-S2, 17.4R3
  • affected 18.1 – < 18.1R3-S2
  • affected 18.2 – < 18.2R2, 18.2R3
  • affected 18.2X75 – < 18.2X75-D40
  • affected 18.3 – < 18.3R1-S2, 18.3R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.3X48-D100, 14.1X53-D140, 14.1X53-D54, 15.1R7-S7, 15.1X49-D210, 15.1X53-D593, 16.1R7-S8, 17.1R2-S12, 17.2R3-S4, 17.3R3-S8, 17.4R2-S2, 17.4R3, 18.1R3-S2, 18.2R2, 18.2X75-D40, 18.3R1-S2, 18.3R2, 18.4R1, and all subsequent releases.

Workaround: Limit access to the Junos CLI and shell to only trusted administrators. Restrict access to "show ospf interface extensive" or "show ospf interface detail" via command authorization until an upgrade can be performed.

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

References (1)

• https://kb.juniper.net/JSA11030 (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-2020-1643](https://trackcve.app/badge/CVE-2020-1643.svg)](https://trackcve.app/cve/CVE-2020-1643)

Record last updated 16 Sept 2024, 23:51 UTC.