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Known exploited vulnerability

CVE-2023-36851

mediumCVSS 3.1 5.3In CISA KEVEPSS 1.1%Published · Juniper Networks

The short answer

CVE-2023-36851 affects Juniper Networks Junos OS and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-11-13: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-306.

Severity

5.3 medium

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

Exploited (CISA KEV)

Yes, since Nov 13, 2023

Federal due date Nov 17, 2023

EPSS, next 30 days

1.1%

Higher than 67% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

What CISA says to do

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

Affected products

Junos OS. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2023-36851 being exploited?

Yes. CISA added CVE-2023-36851 to its Known Exploited Vulnerabilities catalog on 2023-11-13, with a federal remediation due date of 2023-11-17.

How do I fix CVE-2023-36851?

CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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