CISA KEV · Known exploitedCritical

CVE-2023-36845

Juniper Junos OS

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series allows an unauthenticated, network-based attacker to remotely execute code. Using a crafted request which sets the variable PHPRC an attacker is able to modify the PHP execution environment allowing the injection und execution of code. This issue affects Juniper Networks Junos OS on EX Series and SRX 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 21.4...

CVSS: 9.8
EPSS: 94.2%
CISA KEV: Listed
Published: 2023.08.18

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability94.2%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Juniper Junos OS
Affected versions: 21.1, 21.2, 21.3, 21.4, 22.1, 22.2, 22.3, 22.4, 23, 2, < 20.4, 20.4, 23.2
Fixed versions: 20.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

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

Due date: 2023.11.17

1
Identify
Confirm that Juniper Junos OS and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-473
KEV added: 2023.11.13
Ransomware use: 미확인