Actively exploited in the wild
Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
Juniper - Junos OS · Listed in the CISA KEV since 2023-11-13. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CVE-2023-36851
MediumCVSS 5.3KEVSummary
A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to upload and download arbitrary files via J-Web, leading to loss of integrity or confidentiality, and may allow chaining to other vulnerabilities.
Risk Assessment
Risk of unauthorized file access, potentially leading to system integrity compromise and further attacks.
Recommendation
Update Junos OS to a patched version and restrict J-Web access to trusted networks only.
Other vulnerabilities in Juniper Junos OS
See all- CVE-2026-21908High
A Use After Free vulnerability was identified in the 802.1X authentication daemon (dot1xd) of Juniper Networks Junos OS and Junos OS Evolved. An authenticated, network-adjacent attacker can flap a port to crash the dot1xd process, leading to a Denial of Service (DoS), or potentially execute arbitrary code as root. The issue occurs during processing of a change of authorization (CoA) when a port bounce happens, where a freed pointer is later referenced.
- CVE-2026-21906High
A vulnerability in the packet forwarding engine (PFE) of Junos OS on SRX Series allows an unauthenticated network-based attacker to send a specific ICMP packet through a GRE tunnel, causing the PFE to crash and restart. The issue occurs when PowerMode IPsec (PMI) and GRE performance acceleration are enabled, leading to traffic loss.
- CVE-2016-1278High
Junos OS versions before 12.1X46-D50 on SRX Series devices revert to 'safe mode' after a failed upgrade to 12.1X46, allowing root CLI logins without a password. This may allow local users to gain privileges by leveraging the 'request system software' command with the 'partition' option.
- CVE-2016-1271High
In Juniper Junos OS versions before 12.1X46-D45, 12.1X47-D30, 12.3R11, 12.3X48-D25, 13.2R8, 13.3R7, 14.1R6, 14.2R4, 15.1R1, 15.1F2, and 15.1X49-D15, a vulnerability allows local users to gain privileges via crafted combinations of CLI commands and arguments. This is a different vulnerability than CVE-2015-3003, CVE-2014-3816, and CVE-2014-0615.
- CVE-2016-1264High
A race condition in the Op command in Juniper Junos OS allows remote authenticated users to gain privileges via the URL option. This affects versions before 12.1X44-D55, 12.1X46 before 12.1X46-D40, 12.1X47 before 12.1X47-D25, and other listed versions.
- CVE-2014-6450High
In Juniper Junos OS versions before 11.4R12-S4, 12.1X44-D41, 12.1X46-D26, 12.1X47-D11/D15, 12.2R9, 12.2X50-D70, 12.3R8, 12.3X48-D10, 12.3X50-D42, 13.1R4-S3, 13.1X49-D42, 13.1X50-D30, 13.2R6, 13.2X51-D26, 13.2X52-D15, 13.3R3-S3, 14.1R3, 14.2R1, 15.1R1, and 15.1X49-D10, when configured for IPv6, remote attackers can cause a denial of service (mbuf chain corruption and kernel panic) via crafted IPv6 packets.
- CVE-2015-5359High
A vulnerability in Juniper Junos OS allows remote attackers to cause a denial of service by sending a large number of BGP-VPLS advertisements with updated BGP local preference values. This affects multiple versions of the OS before their respective patches.
- CVE-2015-5358High
A vulnerability in Juniper Junos OS allows remote attackers to cause a denial of service by sending a large number of requests, triggering a TCP connection to move to the LAST_ACK state while there is more data to send.
- CVE-2014-3818High
In Juniper Junos OS versions from 9.1 to 14.1 before specific updates, a vulnerability exists that allows remote attackers to cause a denial of service through crafted transitive attributes in a BGP UPDATE. This can lead to memory corruption and a crash and restart of the RDP routing process.
Original NVD description (English source)
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.