Medium 5.3Known exploited (CISA KEV)Published Aug 17, 2023

CVE-2023-36846Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files

Updated under an hour ago (2026-10-19 07:00 UTC)

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It affects Juniper Networks Junos OS and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 13, 2023; federal agencies had to remediate by Nov 17, 2023. Treat that date as your deadline.

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Exploited in the last 30 days

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 user.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series: * All versions prior to 20.4R3-S8; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-306
Known exploited: Added to CISA KEV Nov 13, 2023; federal remediation due Nov 17, 2023Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 93.47% (percentile 100)
Assigned by: juniper
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Juniper Networks Junos OS juniper_networks:junos_os (from the name)	before 20.4R3-S8; from 21.1 before 21.1*; from 21.2 before 21.2R3-S6; from 21.3 before 21.3R3-S5; from 21.4 before 21.4R3-S5; from 22.1 before 22.1R3-S3; from 22.2 before 22.2R3-S2; from 22.3 before 22.3R2-S2, 22.3R3; and 1 more ranges	CNA record
juniper junos juniper:junos	before 20.4; 20.4; 20.4; 20.4; 20.4; 20.4; 20.4; 20.4; and 81 more ranges	NVD

References

https://supportportal.juniper.net/JSA72300vendor-advisory, mitigation
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36846us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.