CVE-2026-21902
High PUBLISHEDJunos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
An Incorrect Permission Assignment for Critical Resource vulnerability in the On-Box Anomaly detection framework of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated, network-based attacker to execute code as root. The On-Box Anomaly detection framework should only be reachable by other internal processes over the internal routing instance, but not over an externally exposed port. With the ability to access and manipulate the service to execute code as root a remote attacker can take complete control of the device. Please note that this service is enabled by default as no specific configuration is required. This issue affects Junos OS Evolved on PTX Series: * 25.4 versions before 25.4R1-S1-EVO, 25.4R2-EVO. This issue does not affect Junos OS Evolved versions before 25.4R1-EVO. This issue does not affect Junos OS.
- CVE Published
- Feb 25, 2026
- Exploitation Reported
- Mar 19, 2026
- CVSS
- 9.3 Critical
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Juniper Networks |
Junos OS Evolved
|
25.4 to < 25.4R1-S1-EVO, 25.4R2-EVO |
Affected |
| Juniper Networks |
Junos OS Evolved
|
0 to < 25.4R1-EVO |
Unaffected |
CVE References
- Vendor Advisory — supportportal.juniper.net supportportal.juniper.net · Vendor Advisory https://supportportal.juniper.net/JSA107128
- Vendor Advisory — kb.juniper.net kb.juniper.net · Vendor Advisory https://kb.juniper.net/JSA107128
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-03-19 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M/U:Red
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-03-19 00:00:00 UTC · The Shadowserver
Proof of concept available
Recorded 2026-02-28 10:43:32 UTC · GitHub
Weaknesses (CWE)
-
Incorrect Permission Assignment for Critical Resource
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2026-02-28 10:43:32 UTC · 4 stars
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 4 months ago00:00 UTC · 4 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
10:43 UTC 5 months ago10:43 UTC · 5 months ago
Public PoC available
Public proof-of-concept code published
-
16:59 UTC 5 months ago16:59 UTC · 5 months ago
CVE published
Vulnerability disclosed publicly
-
17:32 UTC 6 months ago17:32 UTC · 6 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-21902
{
"cve_id": "CVE-2026-21902",
"title": "Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, netwo...",
"affected_vendor": "Juniper Networks",
"affected_product": "Junos OS Evolved",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 9.3,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}