# Juniper Junos OS vulnerabilities Source: https://junglewise.ai/threats/technologies/junos-os Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/junos-os.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 7 vulnerabilities in Juniper Junos OS: 0 in the last 7 days and 0 in the last 90 days, 7 of them critical and 7 exploited in the wild. The most recent, CVE-2025-21590, was published on 13 March 2025. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 0 - All time: 7 (7 critical, 7 exploited in the wild) ## About Juniper Junos OS Operating system for Juniper routing, switching, and security devices. ## Latest Juniper Junos OS vulnerabilities - [CVE-2025-21590: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability](https://junglewise.ai/threats/cve-2025-21590-juniper-junos-os-improper-isolation-or-compartmentalization) (critical, exploited in the wild, CVSS 6.7, published 13 Mar 2025) - [CVE-2023-36844: Juniper Junos OS EX Series PHP External Variable Modification Vulnerability](https://junglewise.ai/threats/cve-2023-36844-juniper-junos-os-ex-series-php-external-variable-modification) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) - [CVE-2023-36846: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability](https://junglewise.ai/threats/cve-2023-36846-juniper-junos-os-srx-series-missing-authentication-for-critical) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) - [CVE-2023-36845: Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability](https://junglewise.ai/threats/cve-2023-36845-juniper-junos-os-ex-series-and-srx-series-php-external-variable) (critical, exploited in the wild, CVSS 9.8, published 13 Nov 2023) - [CVE-2023-36847: Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability](https://junglewise.ai/threats/cve-2023-36847-juniper-junos-os-ex-series-missing-authentication-for-critical) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) - [CVE-2023-36851: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability](https://junglewise.ai/threats/cve-2023-36851-juniper-junos-os-srx-series-missing-authentication-for-critical) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) - [CVE-2020-1631: Juniper Junos OS Path Traversal Vulnerability](https://junglewise.ai/threats/cve-2020-1631-juniper-junos-os-path-traversal-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022) ## Most severe Juniper Junos OS vulnerabilities - [CVE-2023-36845: Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability](https://junglewise.ai/threats/cve-2023-36845-juniper-junos-os-ex-series-and-srx-series-php-external-variable) (critical, exploited in the wild, CVSS 9.8, published 13 Nov 2023) - [CVE-2020-1631: Juniper Junos OS Path Traversal Vulnerability](https://junglewise.ai/threats/cve-2020-1631-juniper-junos-os-path-traversal-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022) - [CVE-2025-21590: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability](https://junglewise.ai/threats/cve-2025-21590-juniper-junos-os-improper-isolation-or-compartmentalization) (critical, exploited in the wild, CVSS 6.7, published 13 Mar 2025) - [CVE-2023-36844: Juniper Junos OS EX Series PHP External Variable Modification Vulnerability](https://junglewise.ai/threats/cve-2023-36844-juniper-junos-os-ex-series-php-external-variable-modification) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) - [CVE-2023-36846: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability](https://junglewise.ai/threats/cve-2023-36846-juniper-junos-os-srx-series-missing-authentication-for-critical) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) - [CVE-2023-36847: Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability](https://junglewise.ai/threats/cve-2023-36847-juniper-junos-os-ex-series-missing-authentication-for-critical) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) - [CVE-2023-36851: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability](https://junglewise.ai/threats/cve-2023-36851-juniper-junos-os-srx-series-missing-authentication-for-critical) (critical, exploited in the wild, CVSS 5.3, published 13 Nov 2023) ## Vulnerabilities per week Nothing was published in the last eight weeks. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Juniper technologies - [Juniper Junos](https://junglewise.ai/threats/technologies/junos): 16 vulnerabilities - [Juniper Junos Os Evolved](https://junglewise.ai/threats/technologies/juniper-junos-os-evolved): 8 vulnerabilities - [Juniper Mx10004](https://junglewise.ai/threats/technologies/mx10004): 3 vulnerabilities - [Juniper Mx10008](https://junglewise.ai/threats/technologies/mx10008): 3 vulnerabilities - [Juniper Mx2008](https://junglewise.ai/threats/technologies/mx2008): 3 vulnerabilities - [Juniper Mx2010](https://junglewise.ai/threats/technologies/mx2010): 3 vulnerabilities - [Juniper Mx2020](https://junglewise.ai/threats/technologies/mx2020): 3 vulnerabilities - [Juniper Mx204](https://junglewise.ai/threats/technologies/mx204): 3 vulnerabilities - [Juniper Mx240](https://junglewise.ai/threats/technologies/mx240): 3 vulnerabilities - [Juniper Mx301](https://junglewise.ai/threats/technologies/mx301): 3 vulnerabilities - [Juniper Mx304](https://junglewise.ai/threats/technologies/mx304): 3 vulnerabilities - [Juniper Mx480](https://junglewise.ai/threats/technologies/mx480): 3 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Juniper Junos OS vulnerabilities", https://junglewise.ai/threats/technologies/junos-os, 9 November 2026.