Security readout for executives and security teams
This is a critical remote code execution flaw in Juniper J-Web on EX switches and SRX firewalls. An unauthenticated attacker who can reach J-Web may be able to change PHP runtime behavior and execute code. Because CISA lists it as known exploited, exposed management interfaces should be treated as urgent. Organizations using Juniper EX Series switches or SRX Series firewalls with J-Web enabled and reachable from untrusted networks face the highest exposure. Older 20.4, 21.x, 22.x, and 23.2 releases listed by Juniper require version review. Treat this as emergency remediation for exposed management planes. The issue is critical, remotely exploitable without authentication, and listed by CISA as known exploited. Patch or isolate reachable J-Web services first, then complete fleet-wide version validation. Mitigation focus: Upgrade affected Junos OS devices to Juniper’s listed fixed releases or later.; Prioritize SRX and EX devices where J-Web is internet-accessible or broadly reachable.; Review Juniper JSA72300 for current vendor mitigations and operational constraints..
Michael Williams reviewed this cited source version on .
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Open ATT&CK lookupCVE-2023-36845 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
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CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://supportportal.juniper.net/JSA72300CVE reference · vendor-advisory, mitigation
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36845CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
PHP External Variable Modification
PHP External Variable Modification represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.