CVE-2019-0040
Junos OS: Specially crafted packets sent to port 111 on any interface triggers responses from the management interface
- Published
- Updated
- Reserved
- Assigned by
- juniper
Description
On Junos OS, rpcbind should only be listening to port 111 on the internal routing instance (IRI). External packets destined to port 111 should be dropped. Due to an information leak vulnerability, responses were being generated from the source address of the management interface (e.g. fxp0) thus disclosing internal addressing and existence of the management interface itself. A high rate of crafted packets destined to port 111 may also lead to a partial Denial of Service (DoS). Note: Systems with fxp0 disabled or unconfigured are not vulnerable to this issue. This issue only affects Junos OS releases based on FreeBSD 10 or higher (typically Junos OS 15.1+). Administrators can confirm whether systems are running a version of Junos OS based on FreeBSD 10 or higher by typing: user@junos> show version | match kernel JUNOS OS Kernel 64-bit [20181214.223829_fbsd-builder_stable_10] Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1F6-S12, 15.1R7-S4; 15.1X53 versions prior to 15.1X53-D236; 16.1 versions prior to 16.1R7-S1; 16.2 versions prior to 16.2R2-S9; 17.1 versions prior to 17.1R3; 17.2 versions prior to 17.2R1-S8; 17.3 versions prior to 17.3R2; 17.4 versions prior to 17.4R1-S1, 17.4R1-S7, 17.4R2. This issue does not affect Junos OS releases prior to 15.1.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| juniperCNA (assigner) | 3.0 | Medium6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| NVDNVD · Modified | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.9% · top 20% of all CVEs (5 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
Affected products
- affected 15.1 – < 15.1F6-S12, 15.1R7-S4
- affected 15.1X53 – < 15.1X53-D236
- affected 16.1 – < 16.1R7-S1
- affected 16.2 – < 16.2R2-S9
- affected 17.1 – < 17.1R3
- affected 17.2 – < 17.2R1-S8
- affected 17.3 – < 17.3R2
- affected 17.4 – < 17.4R1-S1, 17.4R1-S7, 17.4R2
- unaffected all – < 15.1
What to do
Solution: The following software releases have been updated to resolve this specific issue: Junos OS 15.1F6-S12, 15.1R7-S4, 15.1X53-D236, 16.1R7-S1, 16.2R2-S9, 17.1R3, 17.2R1-S8, 17.2R3, 17.3R2, 17.4R1-S1, 17.4R1-S7, 17.4R2, 18.1R1, 18.1X75-D10, and all subsequent releases.
Workaround: Use access lists or firewall filters to limit access to port 111 on the device.
Workaround: Disable the management interface (fxp0) if it is not needed in a production environment.
Workaround: If neither MS MICs nor MS MPCs are deployed, an additional option is to disable rpcbind via the configuration command: set system processes rpcbind-service disable
Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
References (2)
- https://kb.juniper.net/JSA10929 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 107902 (opens in a new tab)vdb-entryx_refsource_BIDx_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
[](https://trackcve.app/cve/CVE-2019-0040)Record last updated .