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Known exploited vulnerability

CVE-2023-36844

mediumCVSS 3.1 5.3In CISA KEVEPSS 90%Published · Juniper Networks

The short answer

CVE-2023-36844 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 PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R3-S1; * 22.4 versions prior to 22.4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.

Weakness: CWE-473.

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

90%

Higher than 100% 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-2023-36844 being exploited?

Yes. CISA added CVE-2023-36844 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-2023-36844?

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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