CVE-2023-36851
Actively exploited. CVE-2023-36851 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Juniper Junos OS on SRX Series contains a missing authentication for critical function vulnerability that allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to webauth_operation.php that doesn't require authentication, an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities.
CSIRTS triage
- What
- The vulnerability allows an unauthenticated attacker to upload arbitrary files via J-Web, impacting file system integrity.
- Who is affected
- Deployments of Juniper Junos OS on SRX Series.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Apply the latest security patch provided by Juniper.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 61% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2023-36851: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerabilitycisa-kev · 2023-11-13
External references
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