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Back to active CVEs
Medium · CVSS 5.3Known ExploitedCVE-2023-36844

Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variablesCVE-2023-36844

Answer in brief

CVE-2023-36844 records a Medium severity (CVSS 5.3) vulnerability in Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables. The current sources mark it as known exploited. The current feed maps Juniper Networks/Junos OS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 17, 2023Updated Oct 21, 2025Source checked Nov 3, 2026First seen by HOL May 24, 2026Material review Oct 21, 2025
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Juniper Networks/Junos OS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Juniper Networks/Junos OSgeneric>=0 <20.4R3-S9 || >=21.1 <21.1* || >=21.2 <21.2R3-S6 || >=21.3 <21.3R3-S5 || >=21.4 <21.4R3-S5 || >=22.1 <22.1R3-S4 || >=22.2 <22.2R3-S2 || >=22.3 <22.3R3-S1 || >=22.4 <22.4R2-S2 22.4R3 || >=23.2 <23.2R1-S1 23.2R220.4R3-S9, 21.1*, 21.2R3-S6, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.2R1-S1, 23.2R2, 22.4R2-S2, 23.2R1-S1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Juniper Networks/Junos OS.
  2. 2Review the reported fix. Source-reported solution: The following software releases have been updated to resolve this specific issue: 20.4R3-S9*, 21.2R3-S7*, 21.3R3-S5*, 21.4R3-S5*, 22.1R3-S4*, 22.2R3-S2, 22.3R3-S1*, 22.4R2-S2*, 22.4R3*, 23.2R1-S1, 23.2R2*, 23.4R1*, and all subsequent releases. *Pending Publication

Evidence timeline and material changes

  1. Published upstream

    Aug 17, 2023

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    May 24, 2026

  4. Added to CISA KEV

    Nov 13, 2023

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • Source referencepacketstormsecurity.com
  • Source referencesupportportal.juniper.net
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-473
Source
CVE List V5
Source checked
Nov 3, 2026
References
3 linked sources
Open source record