Exploited CVEs / Ivanti / CVE-2024-21887

CVE-2024-21887

Ivanti Connect Secure and Policy Secure Command Injection Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2024-01-22 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Ivanti Security Advisories, linked below.

Risk summary

CriticalCISA KEVRansomware

9.1

CVSS v3 base

100%

EPSS exploit probability

Critical

Severity

2024-01-10

Added to KEV

2024-01-22 (past due)

CISA due date

Actively exploited Ivanti Connect Secure and Policy Secure vulnerability, Critical severity, CVSS v3 9.1. Added to the CISA KEV catalog 2024-01-10.

Senserva AI read on CVE-2024-21887 CISA required action Official fix for CVE-2024-21887 Admin questions

Senserva AI Opinion for CVE-2024-21887

One half of the Ivanti zero-day pair that opened 2024: a command injection in the web components of Connect Secure and Policy Secure that, chained with the CVE-2023-46805 authentication bypass, gave unauthenticated attackers code execution on VPN appliances at scale. The campaign compromised government and enterprise gateways worldwide before patches existed, and ransomware use followed. CVSS 9.1, EPSS 100 percent, KEV since January 10, 2024.

Do this: If any Ivanti Connect Secure appliance ran exposed in early 2024, verify it was factory reset and rebuilt on patched firmware, not merely updated in place.

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

Senserva AI Opinion and rich prompt for CVE-2024-21887

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

I run IT security. Facts for CVE-2024-21887, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2024-21887.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed once a day (early morning US Central)):
- CVE-2024-21887: Ivanti Connect Secure and Policy Secure Command Injection Vulnerability
- Affected: Ivanti Connect Secure and Policy Secure
- Severity: Critical, CVSS v3 9.1; EPSS 30-day exploitation probability 100%
- Added to CISA KEV: 2024-01-10; federal remediation due 2024-01-22
- Ransomware-linked: YES
- 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 immediately

Exploited in the wild and used in ransomware campaigns.

The fix ships from the vendor: Ivanti Security Advisories.

Do this now: Move this ahead of everything else in the queue, then verify the fix actually landed on every exposed device.

Updated September 3, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2024-21887

Published: 2024-01-10
Last revised: 2024-01-10
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

2024-01-10 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 9.1; EPSS first scored at 100.0%

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: 2024-01-22 (past due).

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

Official fix for CVE-2024-21887

The authoritative fix and affected-version list are published by the vendor. Find the Connect Secure and Policy Secure advisory on Ivanti Security Advisories.

Ivanti Security Advisories CISA KEV entry

Common questions about CVE-2024-21887

Is CVE-2024-21887 actively exploited?

Yes. CVE-2024-21887 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2024-01-10, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 100%. CISA also reports it is known to be used in ransomware campaigns.

What is the CISA deadline and required action for CVE-2024-21887?

CISA set the federal (BOD 22-01) remediation due date at 2024-01-22, 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-2024-21887?

The authoritative fix is in the vendor advisory: see Ivanti Security Advisories for the patched Connect Secure and Policy Secure 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-2024-21887?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2024-21887'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 once a day (early morning US Central).

Scope and sources

More exploited Ivanti CVEs: CVE-2026-10520 CVE-2026-6973 CVE-2026-1340 CVE-2026-1603 CVE-2026-1281 CVE-2025-4427 CVE-2025-4428 CVE-2025-22457
All Ivanti exploited CVEs on one page: Ivanti 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.