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Response snapshot Oct 27, 2026, 02:21 UTC

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VulnerabilityCVE-2025-0282Known exploitation

Ivanti Connect Secure unauthenticated buffer overflow

A stack-based buffer overflow affects Ivanti Connect Secure, Policy Secure, and Neurons for ZTA gateways. Mandiant identified zero-day exploitation of Connect Secure beginning in mid-December 2024; this does not establish exploitation of every affected product.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
9.0 Critical (CVSS 3.1)
Chance of exploitation
100.0% in the next 30 days
CISA federal deadline
Jan 15, 2025: passed
Sources
3 independent sources

What to do

Follow CISA's updated hunt, reset, patch, and recovery instructions. Use an external known-clean image for cloud or virtual factory resets, investigate connected systems, and revoke exposed credentials, keys, and certificates when compromise is found.

CISA's required action: Apply mitigations as set forth in the CISA instructions linked below to include conducting hunt activities, taking remediation actions if applicable, and applying updates prior to returning a device to service.

Read Mandiant Ivanti zero-day investigation (opens a new tab)

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Known
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

9.0

Version 3.1As of

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

100.0%

Scored Percentile 100.0%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    Mandiant Ivanti zero-day investigation (opens a new tab)

    Observed pre-disclosure exploitation of Connect Secure and limitations of integrity checking.

    Published Checked

  2. Primary source

    CISA mitigation instructions for CVE-2025-0282 (opens a new tab)

    March 28, 2025 revision, threat hunting, known-clean factory reset images, patching, and credential recovery.

    Published Date not suppliedChecked

  3. Primary source

    CISA KEV JSON: CVE-2025-0282 (opens a new tab)

    This CVE's membership, addition date, federal due date, required action, and known ransomware-use field.

    Published Checked

  4. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2025-0282, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

  5. Primary source

    CVE Program CNA ivanti (opens a new tab)

    The published CVE-2025-0282 document's CNA supplies this CVSS 3.1 base score, vector, and authoritative source update date.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2025, March 28). Ivanti Connect Secure unauthenticated buffer overflow (CVE-2025-0282). https://kevwire.com/record/CVE-2025-0282

MLA

"Ivanti Connect Secure unauthenticated buffer overflow (CVE-2025-0282)." KEVWire, 28 Mar. 2025, kevwire.com/record/CVE-2025-0282.

Chicago

KEVWire. "Ivanti Connect Secure unauthenticated buffer overflow (CVE-2025-0282)." Last modified March 28, 2025. https://kevwire.com/record/CVE-2025-0282.

Evidence summary (plain text)

Ivanti Connect Secure unauthenticated buffer overflow (Jan 8, 2025).
A stack-based buffer overflow affects Ivanti Connect Secure, Policy Secure, and Neurons for ZTA gateways. Mandiant identified zero-day exploitation of Connect Secure beginning in mid-December 2024; this does not establish exploitation of every affected product.
CVSS 9.0 (version 3.1; evidence as of Jan 8, 2025; https://cveawg.mitre.org/api/cve/CVE-2025-0282).
EPSS 100.0% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2025-0282&date=2026-10-26).
Sources:
Mandiant Ivanti zero-day investigation: https://cloud.google.com/blog/topics/threat-intelligence/ivanti-connect-secure-vpn-zero-day
CISA mitigation instructions for CVE-2025-0282: https://www.cisa.gov/cisa-mitigation-instructions-CVE-2025-0282
CISA KEV JSON: CVE-2025-0282: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2025-0282&date=2026-10-26
CVE Program CNA ivanti: https://cveawg.mitre.org/api/cve/CVE-2025-0282
Record ID: CVE-2025-0282.
Record origin: Editorial selection.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Documented by a cited source. KEV membership alone does not establish zero-day status.
CISA federal due date: Jan 15, 2025. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was assembled editorially. Editorial review: Oct 26, 2026. Editorial selection does not make a reported claim independently confirmed.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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