CVE-2026-33803: An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause

mediumCVSS 6.5CVE-2026-33803

An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device. Due to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets. This issue affects Junos OS Evolved: - all versions before 23.2R2-S7-EVO, - 23.4 versions before 23.4R2-S8-EVO, - 24.2 versions before 24.2R2-S5-EVO, - 24.4 versions before 24.4R2-S4-EVO, - 25.2 versions before 25.2R2-S1-EVO, - 25.4 versions before 25.4R1-S2-EVO.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 6.5
Published: 2026-07-09
Last updated: 2026-07-10
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-33803

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-338030.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-33803	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Juniper JUNOS and JUNOS Evolved: Multiple vulnerabilitiescert-bund
unknownJuniper Junos OS Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in Juniper Networks products (July 09, 2026)cert-fr-avis

Recent advisories for An Improper Restriction

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-15079: Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Login Disabl…nvd · 2026-07-10
mediumCVE-2026-54470: Dell Unisphere for PowerMax, version(s) 10.3.0.5 and prior contain(s) an Improper Restriction …nvd · 2026-07-10
criticalCVE-2026-40005: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability i…nvd · 2026-07-10
highCVE-2026-57028: An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Junipe…nvd · 2026-07-09
highCVE-2026-47896: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability i…nvd · 2026-07-03
criticalCVE-2026-47898: Improper Restriction of XML External Entity Reference vulnerability in Apache Lucene.Net (Luce…nvd · 2026-07-03