Exploited CVEs / Juniper / CVE-2023-36845

CVE-2023-36845

Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2023-11-17 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.

Risk summary

CriticalCISA KEV

9.8

CVSS base

94%

EPSS exploit probability

Critical

Severity

2023-11-13

Added to KEV

2023-11-17 (past due)

CISA due date

Actively exploited Juniper Junos OS vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2023-11-13.

Senserva AI read on CVE-2023-36845 CISA required action Official fix for CVE-2023-36845 Admin questions

Senserva AI Opinion for CVE-2023-36845

This is the Critical (CVSS 9.8) member of the Juniper PHP environment variable family: on EX Series and SRX Series devices an unauthenticated attacker can set the PHPRC variable through a crafted request, which turns configuration control into code execution paths. With a 94% EPSS score and a spot on the CISA KEV list, exposed Juniper web interfaces running vulnerable code are being found and hit. Switches and firewalls are the roads into everything else, so treat this as perimeter-grade urgency.

Do this: Patch EX and SRX Series devices immediately and take their web management interfaces off any internet-facing address.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2023-36845

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I run IT security. Facts for CVE-2023-36845, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2023-36845.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2023-36845: Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability
- Affected: Juniper Junos OS
- Severity: Critical, CVSS 9.8; EPSS 30-day exploitation probability 94%
- Added to CISA KEV: 2023-11-13; federal remediation due 2023-11-17
- Ransomware-linked: no
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) The fastest safe path to remediation. 4) How to check whether my environment is exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch now

Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.

No vendor fix is mapped yet. This page refreshes daily and will name the patch the day one is published.

Do this now: Federal remediation deadline 2023-11-17; treat it as your outer bound. Patch now and verify deployment on every exposed device.

Updated August 14, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2023-36845

Published: 2023-11-13
Last revised: 2023-11-13
Changes tracked: 1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

Senserva Watchevery change we have recorded for this one

What changed, and when

Drawn by Senserva Vivid from the Senserva change record. Hover any point for its date and value.

2023-11-13 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 9.8; EPSS first scored at 93.5%
2026-07-23 EPSS 93.5% to 94.2%
2026-08-07 EPSS 94.2% to 93.5%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

CISA required action

Federal (BOD 22-01) remediation due date: 2023-11-17 (past due).

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

Official fix for CVE-2023-36845

Check the vendor's security advisory channel for the patched Junos OS versions and workarounds.

CISA KEV entry

Common questions about CVE-2023-36845

Is CVE-2023-36845 actively exploited?

Yes. CVE-2023-36845 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2023-11-13, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 94%.

What is the CISA deadline and required action for CVE-2023-36845?

CISA set the federal (BOD 22-01) remediation due date at 2023-11-17, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What fixes CVE-2023-36845?

Check the vendor's security advisory for the patched Junos OS versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2023-36845?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2023-36845's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).

Scope and sources

More exploited Juniper CVEs: CVE-2015-7755 CVE-2025-21590 CVE-2023-36846 CVE-2023-36844 CVE-2023-36847 CVE-2023-36851 CVE-2020-1631
All Juniper exploited CVEs on one page: Juniper vulnerabilities actively exploited.
Authoritative references: CVE record NVD detail CISA KEV catalog FIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.