Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
An Improper Isolation or Compartmentalization vulnerability in the kernel of Juniper Networks Junos OS allows a local attacker with high privileges to compromise the integrity of the device. A local attacker with access to the shell is…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 2 / 5
- KEV catalog (CISA)13 Mar 2025
- Exploited in EUVD (ENISA)13 Mar 2025
- Used by ransomwareno
- EPSS above 10 %1.7%
- No account, over the networkno
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
An Improper Isolation or Compartmentalization vulnerability in the kernel of Juniper Networks Junos OS allows a local attacker with high privileges to compromise the integrity of the device. A local attacker with access to the shell is able to inject arbitrary code which can compromise an affected device. This issue is not exploitable from the Junos CLI. This issue affects Junos OS: * All versions before 21.2R3-S9, * 21.4 versions before 21.4R3-S10, * 22.2 versions before 22.2R3-S6, * 22.4 versions before 22.4R3-S6, * 23.2 versions before 23.2R2-S3, * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R1-S2, 24.2R2.
Affected products
- 23.2 <23.2R2-S3
- 24.2 <24.2R1-S2, 24.2R2
- 22.2 <22.2R3-S6
- 0 <21.2R3-S9
- 23.4 <23.4R2-S4
- 21.4 <21.4R3-S10
- 22.4 <22.4R3-S6
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
References
Other exploited vulnerabilities from the same vendor
- CVE-2015-7755Juniper ScreenOS Improper Authentication Vulnerability8.2 · Background exploitation
- CVE-2023-36851Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability4.0 · Background exploitation
- CVE-2023-36847Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability7.0 · Background exploitation
- CVE-2023-36846Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability7.3 · Background exploitation
- CVE-2023-36845Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability9.2 · Background exploitation
- CVE-2023-36844Juniper Junos OS EX Series PHP External Variable Modification Vulnerability7.2 · Background exploitation