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-2023-36844

CVE-2023-36844MEDIUM

Juniper Networks Junos OS — Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  L  N    5.3   .8996   99.8   YES

AFFECTED
  Product   Versions     Fixed
  Junos OS  unspecified  —

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

CWE-473 · CNA: juniper · CVSS v3.1 · 3 references · KEV due November 17, 2023

Description

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R3-S1; * 22.4 versions prior to 22.4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 27, 2023	Reserved	Reserved by juniper
August 17, 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	—	—	—

Weaknesses

CWE-473

References (3)

http://packetstormsecurity.com/files/174865/Juniper-SRX-Firewall-EX-Switch-Remote-Code-Execution.html
https://supportportal.juniper.net/JSA72300 [vendor-advisory, mitigation]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36844 [government-resource]

Authoritative record: CVE-2023-36844 at cve.org

Vendors: juniper networks

Weaknesses: CWE-473

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2023-36844 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.