# EX4300 Series: When a firewall filter is applied to a loopback interface, other firewall filters for multicast traffic may fail

CVE record · `CVE-2019-0048`

- **Identifiers:** `CVE-2019-0048`
- **State:** Confirmed
- **Severity:** CVSS 5.8 Medium
- **Critical:** No
- **CNA:** juniper
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md)
- **Technologies:** [Juniper Networks Junos OS](https://agentprime.io/advisories/technology/juniper-networks-junos-os.md)
- **Published:** 11 Jul 2019
- **Updated:** 17 Sept 2024
- **Reviewed by a person:** No

Published by the CVE Program (CNA: juniper) at 11 Jul 2019, 19:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Juniper Networks. Product: Junos OS.
  - affected: `14.1X53 versions prior to 14.1X53-D51 and 14.1X53-D115 on EX4300 Series`
  - affected: `17.1 versions prior to 17.1R3 on EX4300 Series`
  - affected: `17.2 versions prior to 17.2R3-S2 on EX4300 Series`
  - affected: `17.3 versions prior to 17.3R3-S3 on EX4300 Series`
  - affected: `17.4 versions prior to 17.4R2-S5 and 17.4R3 on EX4300 Series`
  - affected: `18.1 versions prior to 18.1R3-S1 on EX4300 Series`
  - affected: `18.2 versions prior to 18.2R2 on EX4300 Series`
  - affected: `18.3 versions prior to 18.3R2 on EX4300 Series`

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 5.8 Medium, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`, from CNA (juniper)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0097, the 61st percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 11 Jul 2019. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2019-0048](https://www.cve.org/CVERecord?id=CVE-2019-0048)
- [NVD: CVE-2019-0048](https://nvd.nist.gov/vuln/detail/CVE-2019-0048)

### References from the CNA

- <https://kb.juniper.net/JSA10942> (confirm)

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2019-0048>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2019-0048/>. Everything for agents: <https://agentprime.io/llms.txt>.