CVE-2023-36851
Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files
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.
- Record
CVE-2023-36851- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-306
- Updated
- 2026-11-02
EUVDEUVD-2023-40771
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.
- Record
EUVD-2023-40771- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-792v-3cgw-26xq
A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX...
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 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:
- 22.4 versions prior to 22,4R2-S2, 22.4R3;
- 23.2 versions prior to 23.2R2.
- Record
GHSA-792v-3cgw-26xq- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-306
- Updated
- 2026-11-02
CISA KEV No score
Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
Juniper Junos OS on SRX Series contains a missing authentication for critical function vulnerability that 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 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.
- Record
CVE-2023-36851- Weakness
- CWE-306
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2023-36851- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-306
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-36851 is a medium vulnerability (CVSS 5.3) in Juniper Junos, published September 26, 2023. CISA lists it as known to be exploited, since November 13, 2023. EUVD reports exploitation since November 13, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.12%, the 66th percentile. No source names a fixed version.