What is CVE-2023-36844?

CVE-2023-36844 is a medium-severity vulnerability in Juniper Ex2200, classified under CWE-473. CVSS score: 5.3/10. Published 2023-08-17.

How severe is CVE-2023-36844?

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

Is CVE-2023-36844 known to be exploited?

Yes. CVE-2023-36844 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13), indicating it is being actively exploited. 25 public proof-of-concept repositories are indexed.

Vulnerability in Juniper Ex2200

CVE-2023-36844

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.

EPSS: 0.910 (99.8th 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-473

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)
sirt@juniper.net (Exploit, VDB Entry, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2023-36844?: CVE-2023-36844 is a medium-severity vulnerability in Juniper Ex2200, classified under CWE-473. CVSS score: 5.3/10. Published 2023-08-17.
How severe is CVE-2023-36844?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2023-36844 known to be exploited?: Yes. CVE-2023-36844 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13), indicating it is being actively exploited. 25 public proof-of-concept repositories are indexed.