CVE-2023-36851Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files
Updated under an hour ago ()
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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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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 webauth_operation.php that doesn't require authentication, an attacker is able to upload and download arbitrary files via J-Web, leading to a loss of integrity or confidentiality, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series: * 21.2 versions prior to 21.2R3-S8; * 21.4 versions prior to 21.4R3-S6; * 22.1 versions prior to 22.1R3-S5; * 22.2 versions prior to 22.2R3-S3; * 22.3 versions prior to 22.3R3-S2; * 22.4 versions prior to 22,4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S2, 23.2R2.
- 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)
- 1.12% (percentile 66)
- Assigned by
- juniper
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Juniper Networks Junos OS juniper_networks:junos_os (from the name) | from 21.2 before 21.2R3-S8; from 21.4 before 21.4R3-S6; from 22.1 before 22.1R3-S5; from 22.2 before 22.2R3-S3; from 22.3 before 22.3R3-S2; from 22.4 before 22.4R2-S2, 22.4R3; from 23.2 before 23.2R1-S2, 23.2R2 | CNA record |
juniper junos juniper:junos | 21.2; 21.2; 21.2; 21.2; 21.2; 21.2; 21.2; 21.2; and 54 more ranges | NVD |
References
- https://supportportal.juniper.net/JSA72300vendor-advisory, mitigation
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36851us-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.