Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2023-36851

CVE-2023-36851MEDIUM

Juniper Networks Junos OS — Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  L  N    5.3   .0112   65.1   YES

AFFECTED
  Product   Versions  Fixed
  Junos OS  21.2 –    —

TIMELINE
  Jun 27  Reserved by juniper
  Sep 26  Published (CNA: juniper)
  Nov 13  Added to CISA KEV, remediation due 2023-11-17

CWE-306 · CNA: juniper · CVSS v3.1 · 2 references · KEV due November 17, 2023

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 27, 2023	Reserved	Reserved by juniper
September 26, 2023	Published	Published (CNA: juniper)
November 13, 2023	KEV ADDED	Added to CISA KEV, remediation due 2023-11-17

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Juniper Networks	Junos OS	—	21.2	—

Weaknesses

CWE-306

References (2)

https://supportportal.juniper.net/JSA72300 [vendor-advisory, mitigation]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36851 [government-resource]

Authoritative record: CVE-2023-36851 at cve.org

Vendors: juniper networks

Weaknesses: CWE-306

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2023-36851 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.