CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function
Unauthenticated attackers can upload and download arbitrary files on Juniper SRX devices via J-Web, compromising file integrity and confidentiality.
- Exploited in the wild
- Since 13 Nov 2023
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-36851?
CVE-2023-36851 is a medium-severity missing authorization vulnerability in Juniper Junos, published on 26 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-306
Which versions are affected by CVE-2023-36851?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2023-36851?
No fix has been published for CVE-2023-36851 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2023.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-36851 being exploited?
Yes. Attackers have exploited CVE-2023-36851 in the wild since at least 13 Nov 2023.
Other vulnerabilities in Juniper Junos
- CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification
- CVE-2020-1631 Juniper Junos OS Path Traversal
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification
- CVE-2023-36846 Juniper Junos OS SRX Series Missing Authentication for Critical Function
Sources
Also known as GHSA-792v-3cgw-26xq.