Junos OS: RPD crash while processing a specific BGP UPDATE when Multipath or add-path features are enabled

Description

On Juniper Networks Junos OS devices with Multipath or add-path feature enabled, processing a specific BGP UPDATE can lead to a routing process daemon (RPD) crash and restart, causing a Denial of Service (DoS). Continued receipt and processing of this UPDATE message will create a sustained Denial of Service (DoS) condition. This BGP UPDATE message can propagate to other BGP peers with vulnerable Junos versions on which Multipath or add-path feature is enabled, and cause RPD to crash and restart. This issue affects both IBGP and EBGP deployments in IPv4 or IPv6 network. Junos OS devices that do not have the BGP Multipath or add-path feature enabled are not affected by this issue. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S18; 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R3-S3;

Scores

EPSS (exploitation in 30 days)

0.95% · top 39% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• CWE-754 Improper Check for Unusual or Exceptional Conditions (opens in a new tab)All about CWE-754 and its CVEs

Affected products

• Juniper Networks · Junos OS

  • affected 12.3 – < 12.3R12-S18
  • affected 15.1 – < 15.1R7-S9
  • affected 17.3 – < 17.3R3-S11
  • affected 17.4 – < 17.4R2-S13, 17.4R3-S4
  • affected 18.1 – < 18.1R3-S12
  • affected 18.2 – < 18.2R3-S7
  • affected 18.3 – < 18.3R3-S4
  • affected 18.4 – < 18.4R2-S6, 18.4R3-S6
  • affected 19.1 – < 19.1R3-S3

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.3R12-S18, 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 18.1R3-S12, 18.2R3-S7, 18.3R3-S4, 18.4R2-S6, 18.4R3-S6, 19.1R3-S3, 19.2R1, and all subsequent releases.

Workaround: BGP Multipath or add-path features can be disabled to mitigate this issue.

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

References (1)

• https://kb.juniper.net/JSA11186 (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-2021-0282](https://trackcve.app/badge/CVE-2021-0282.svg)](https://trackcve.app/cve/CVE-2021-0282)

Record last updated 16 Sept 2024, 19:35 UTC.