What is CVE-2023-36845?

CVE-2023-36845 is a critical-severity vulnerability in Juniper Junos, classified under CWE-473. CVSS score: 9.8/10. Published 2023-08-17.

How severe is CVE-2023-36845?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-36845 known to be exploited?

Yes. CVE-2023-36845 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13), indicating it is being actively exploited. 44 public proof-of-concept repositories are indexed.

Vulnerability in Juniper Junos

CVE-2023-36845

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series allows an unauthenticated, network-based attacker to remotely execute code. Using a crafted request which sets the variable PHPRC an attacker is able to modify the PHP execution environment allowing the injection und execution of code. This issue affects Juniper Networks Junos OS on EX Series and SRX 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 22.3R2-S2, 22.3R3-S1; * 22.4 versions prior to 22.4R2-S1, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.

EPSS: 0.946 (99.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Juniper Junos — versions 20.4, 21.1, 21.2
Juniper Srx100
Juniper Srx110
Juniper Srx1400
Juniper Srx1500
Juniper Srx210
Juniper Srx220
Juniper Srx240
Juniper Srx240h2
Juniper Srx240m

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

Frequently asked questions

What is CVE-2023-36845?: CVE-2023-36845 is a critical-severity vulnerability in Juniper Junos, classified under CWE-473. CVSS score: 9.8/10. Published 2023-08-17.
How severe is CVE-2023-36845?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-36845 known to be exploited?: Yes. CVE-2023-36845 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13), indicating it is being actively exploited. 44 public proof-of-concept repositories are indexed.