CVE-2023-36851: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability

CVE-2023-36851 · Severity: critical · CVSS 5.3 · Exploited in the wild · Published 2023-11-13

A missing authentication vulnerability in the webauth_operation.php component of Juniper Junos OS on SRX Series allows unauthenticated network-based attackers to upload and download arbitrary files via J-Web. This can lead to a loss of file system integrity and confidentiality, potentially serving as a vector for chaining further attacks.

Technologies: Juniper Junos OS. Vendors: Juniper.

Quick answers

Is CVE-2023-36851 exploited in the wild?
Yes. CVE-2023-36851 is known to be exploited in the wild, first recorded on 13 November 2023. Treat it as urgent.
How severe is CVE-2023-36851?
Critical severity, with a CVSS score of 5.3, published 13 November 2023.
Which products and versions are affected?
Juniper Networks Junos OS SRX Series 21.2 versions prior to 21.2R3-S8; 21.4 versions prior to 21.4R3-S6; 22.1 versions prior to 22.1R3-S5; 22.2 versions prior to 22.2R3-S3; 22.3 versions prior to 22.3R3-S2; 22.4 versions prior to 22,4R2-S2, 22.4R3; 23.2 versions prior to 23.2R1-S2, 23.2R2..
Is there a fix for CVE-2023-36851?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-36851 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2023-36851?
Check whether you run Juniper Junos OS. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Juniper Networks Junos OS SRX Series 21.2 versions prior to 21.2R3-S8; 21.4 versions prior to 21.4R3-S6; 22.1 versions prior to 22.1R3-S5; 22.2 versions prior to 22.2R3-S3; 22.3 versions prior to 22.3R3-S2; 22.4 versions prior to 22,4R2-S2, 22.4R3; 23.2 versions prior to 23.2R1-S2, 23.2R2.

Timeline

  • 2023-11-13: disclosed
  • 2023-11-13: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2023-11-13: exploited: Reported as exploited in the wild per CISA KEV and advisory metadata.

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