CVE-2025-53844

Description

A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to execute unauthorized code or commands via specially crafted packets.

Overview

State: PUBLISHED
Assigner (CNA): fortinet
CVSS severity: HIGH
CVSS score: 8.3 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Effective score: 8.3 / 10 HIGH source: CNA overview
CWE(s): CWE-787
Reserved: 2025-07-10
Published: 2026-05-12 18:54 UTC
Last updated: 2026-05-13 05:58 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2025/53xxx/CVE-2025-53844.json
Linked Threat: CVE-2025-53844 — CVE-2025-53844

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-12 18:16:35 UTC
NVD last modified: 2026-06-17 09:39:01 UTC
NVD CVSS v3.1: 8.8 / 10 HIGH source: psirt@fortinet.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 2.8 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0056 (probability of exploitation in next 30 days)
EPSS percentile: 43.48% vs all CVEs — higher = more likely to be exploited, as of 2026-07-27

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2025-209802
Assigner: fortinet
Published: May 12, 2026, 4:54:10 PM
Updated: May 13, 2026, 3:58:28 AM
EUVD base score (CVSS 3.1): 8.3 / 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
EUVD-reported EPSS: 0.0200
Vendors: Fortinet
Products: FortiOS (7.2.0 ≤7.2.11)

FortiOS (6.4.0 ≤6.4.16)

FortiOS (7.0.0 ≤7.0.17)

FortiOS (6.0.0 ≤6.0.18)

FortiOS (7.6.0 ≤7.6.3)

FortiOS (7.4.0 ≤7.4.8)

FortiOS (6.2.0 ≤6.2.17)

ENISA description: A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to execute unauthorized code or commands via specially crafted packets.

EUVD references (1)

https://fortiguard.fortinet.com/psirt/FG-IR-26-123

Affected products (1)

Vendor	Product	Versions	Platforms
Fortinet	FortiOS	`7.6.0` (affected), `7.4.0` (affected), `7.2.0` (affected), `7.0.0` (affected), `6.4.0` (affected), `6.2.0` (affected), `6.0.0` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://fortiguard.fortinet.com/psirt/FG-IR-26-123

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://fortiguard.fortinet.com/psirt/FG-IR-26-123

Web references (4)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://nvd.nist.gov/vuln/detail/CVE-2025-53844 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2025-53844 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org
https://www.securityweek.com/fortinet-ivanti-patch-critical-vulnerabilities/ tenable:www.securityweek.com

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://fortiguard.fortinet.com/psirt/FG-IR-26-123 psirt@fortinet.com Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-864900.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Microsoft and Adobe Patch Tuesday, September 2025 Security Update ...

web:blog.qualys.com

EVALUATE Vendor-Suggested Mitigation with Policy Audit With Qualys Policy Audit's Out-of-the-Box Mitigation or Compensatory Controls, reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done now; these security controls are not recommended by any industry standards, such as CIS, DISA-STIG.

2026-05-22 14:28 UTC
Microsoft Patch Tuesday for August 2025 — Snort rules and prominent ...

web:blog.talosintelligence.com

Microsoft has released its monthly security update for August 2025 , which includes 111 vulnerabilities affecting a range of products, including 13 that Microsoft marked as "critical".

2026-05-22 14:28 UTC
Microsoft Releases Guidance on High-Severity Vulnerability (CVE-2025 ...

web:cisa.gov

Update (08/12/ 2025 ): CISA has updated this alert to provide clarification on identifying Exchange Servers on an organization's networks and provided further guidance on running the Microsoft Exchange Health Checker. Update (08/07/ 2025 ): CISA issued Emergency Directive (ED) 25-02: Mitigate Microsoft Exchange Vulnerability in response to CVE - 2025 -53786

2026-05-22 14:28 UTC
New BitUnlocker Attack Bypasses Windows 11 Disk Encryption in Just 5 ...

web:cyberpress.org

A newly published proof-of-concept tool called BitUnlocker exposes a dangerous downgrade attack that can bypass Microsoft's BitLocker full-disk encryption on fully patched Windows 11 machines, granting complete access to encrypted drives in under five minutes. The attack exploits CVE - 2025 -48804, a vulnerability in Windows BitLocker that allows an attacker to mix untrusted data with trusted ...

2026-05-22 14:28 UTC
Microsoft Patch Tuesday August 2025: 107 Vulnerabilities ... - GBHackers

web:gbhackers.com

Microsoft has rolled out its August 2025 Patch Tuesday fixes, addressing a total of 107 vulnerabilities across its ecosystem.

2026-05-22 14:28 UTC
Microsoft Patch Tuesday, September 2025 Edition - Krebs on Security

web:krebsonsecurity.com

Microsoft Corp. today issued security updates to fix more than 80 vulnerabilities in its Windows operating systems and software. There are no known "zero-day" or actively exploited ...

2026-05-22 14:28 UTC
Nvd - Cve-2025-53844

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-22 14:28 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-22 14:28 UTC
Vulnerability Remediation vs. Mitigation: What are the Differences ...

web:www.secure.com

Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

2026-05-22 14:28 UTC
CVE-2025-53844 | Tenable®

web:www.tenable.com

A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to execute unauthorized code or commands via specially crafted packets.

2026-05-22 14:28 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2025-53844.json.

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                "timestamp": "2026-05-12T00:00:00+00:00",
                "version": "2.0.3"
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      "descriptions": [
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          "value": "A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to execute unauthorized code or commands via specially crafted packets."
        }
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      "metrics": [
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C",
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          "format": "CVSS"
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-787",
              "description": "Execute unauthorized code or commands",
              "lang": "en",
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        "orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
        "shortName": "fortinet"
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      "references": [
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          "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-123"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to FortiOS version 7.6.4 or above\nUpgrade to FortiOS version 7.4.9 or above\nUpgrade to FortiOS version 7.2.12 or above\nUpgrade to FortiOS version 7.0.18 or above\nFortinet remediated this issue in FortiSASE version 25.3.a and hence customers do not need to perform any action.\nUpgrade to FortiSwitchManager version 7.2.7 or above\nUpgrade to FortiSwitchManager version 7.0.6 or above\nFortinet remediated this issue in FortiEdgeCloud version 25.3 and hence customers do not need to perform any action."
        }
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  },
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    "assignerShortName": "fortinet",
    "cveId": "CVE-2025-53844",
    "datePublished": "2026-05-12T16:54:10.126Z",
    "dateReserved": "2025-07-10T08:53:33.015Z",
    "dateUpdated": "2026-05-13T03:58:28.011Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}