Juniper JUNOS Evolved: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit Administratorrechten
WID-SEC-2026-0535 · first 26.02.2026 · updated 04.03.2026 · CVSS 10,0
What it is about
JUNOS ist das "Juniper Network Operating System", das in Juniper Appliances verwendet wird. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Juniper JUNOS Evolved ausnutzen, um beliebigen Programmcode mit Administratorrechten auszuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode mit Administratorrechten auszuführen
Am I affected?
Affected according to the BSI:
- Juniper JUNOS Evolved <25.4R1-S1-EVO
- Juniper JUNOS Evolved <25.4R2-EVO
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Juniper JUNOS Evolved 25.4R1-S1-EVO
- Juniper JUNOS Evolved 25.4R2-EVO
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Juniper Security Bulletin JSA107123 vom 2026-02-25 supportportal.juniper.net
- WatchTower Labs Report vom 2026-03-03 labs.watchtowr.com
CVE: CVE-2026-21902
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.