What is CVE-2023-36851?

CVE-2023-36851 is a medium-severity vulnerability in Juniper Ex2200, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2023-09-27.

How severe is CVE-2023-36851?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2023-36851 known to be exploited?

Yes. CVE-2023-36851 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Auth bypass in Juniper Ex2200

CVE-2023-36851

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.

Vulnerability class: Broken Authentication

EPSS: 0.011 (63.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-11-13. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-11-17.

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Public proof-of-concept exploits

References

sirt@juniper.net (vendor-advisory, mitigation, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2023-36851?: CVE-2023-36851 is a medium-severity vulnerability in Juniper Ex2200, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2023-09-27.
How severe is CVE-2023-36851?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2023-36851 known to be exploited?: Yes. CVE-2023-36851 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.