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

- Exploited (CISA KEV): yes, added 2023-11-13
- Published: 2023-09-26
- CVSS: 5.3 MEDIUM (v3.1)
- EPSS: 1.1% (66th percentile)
- CWE: CWE-306

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series 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 and download arbitrary files via J-Web, leading to a loss of 

integrity or confidentiality, which may allow chaining to other vulnerabilities.


This issue affects Juniper Networks Junos OS on 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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2023-36851 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2023-36851