CVE-2023-36851

CVE-2023-36851 is a medium-severity (CVSS 5.3) vulnerability in Juniper Junos OS. CISA added it to the Known Exploited Vulnerabilities catalog on November 13, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2023. CISA does not currently list it as used in ransomware campaigns. Juniper has 8 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

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 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

• https://supportportal.juniper.net/JSA72300
• https://supportportal.juniper.net/JSA72300
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36851