CVE-2023-36851
Juniper Junos OS: SRX Series Missing Authentication for Critical Function
As of , CVE-2023-36851 in Juniper Junos OS is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.
- Exploited
- Yes: CISA listed it on 13 November 2023
- US federal deadline
- 17 November 20234 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.01Higher than 65% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- 0.00 on 13 November 2023EPSS on the day CISA listed it.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: supportportal.juniper.netLinks below, from CISA's entry.
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA's required action
What the flaw is
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.
CISA's 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.
The CVE record's description, from juniper
- CVE published
- 26 September 2023
- Assigned by
- juniper
- CVSS
- 5.3 Medium (CVSS 3.1, from the CNA)
- CWE-306
- Missing Authentication for Critical Function
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Junos OS: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2023-36845EX Series and SRX Series PHP External Variable Modification | Juniper Junos OS | Patch this weekMetasploit module; EPSS 0.95 | 0.95 | ||
| CVE-2023-36844EX Series PHP External Variable Modification | Juniper Junos OS | Patch this weekEPSS 0.90 | 0.90 | ||
| CVE-2023-36846SRX Series Missing Authentication for Critical Function | Juniper Junos OS | Patch this weekEPSS 0.93 | 0.93 | ||
| CVE-2023-36847EX Series Missing Authentication for Critical Function | Juniper Junos OS | Patch this weekEPSS 0.83 | 0.83 | ||
| CVE-2020-1631Path Traversal | Juniper Junos OS | Patch soon | 0.05 | ||
| CVE-2025-21590Improper Isolation or Compartmentalization | Juniper Junos OS | Patch soon | 0.02 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org