CVE-2023-36844: Juniper Junos OS EX Series PHP External Variable Modification Vulnerability

CVE-2023-36844 · Severity: critical · CVSS 5.3 · Exploited in the wild · Published 2023-11-13

A PHP External Variable Modification vulnerability in the J-Web component of Juniper Networks Junos OS on EX Series switches allows unauthenticated network-based attackers to control critical environment variables. By sending crafted requests, an attacker can modify PHP environment variables, potentially leading to a partial loss of integrity or enabling the chaining of further vulnerabilities.

Technologies: Juniper Junos OS. Vendors: Juniper.

Quick answers

Is CVE-2023-36844 exploited in the wild?
Yes. CVE-2023-36844 is known to be exploited in the wild, first recorded on 13 November 2023. Treat it as urgent.
How severe is CVE-2023-36844?
Critical severity, with a CVSS score of 5.3, published 13 November 2023.
Which products and versions are affected?
Juniper Networks Junos OS 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..
Is there a fix for CVE-2023-36844?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-36844 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2023-36844?
Check whether you run Juniper Junos OS. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Juniper Networks Junos OS 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.

Timeline

  • 2023-11-13: disclosed: Published date and date added to CISA KEV catalog.
  • 2023-11-13: kev added
  • 2023-11-17: other: CISA due date for mitigation.

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