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CVE-2023-36844

MEDIUM5.3
CISA KEV

Published 2023-08-17 · Updated 2026-06-17 · Source sirt@juniper.net

Summary

CVE-2023-36844 is a medium-severity (CVSS 5.3) vulnerability in Juniper Junos OS. CISA added it to the Known Exploited Vulnerabilities catalog on November 13, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2023. CISA does not currently list it as used in ransomware campaigns. Juniper has 8 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 8 known-exploited Juniper vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE-473

CISA Known-Exploited Vulnerability

Product: Juniper — Junos OS

Name: Juniper Junos OS EX Series PHP External Variable Modification Vulnerability

Date added: 2023-11-13 · Due: 2023-11-17

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

References

View on NVD