CVE-2025-61258Public exploitNetwork attack vector

Server hang via slow incomplete POST bodies

Published Dec 9, 2025 · Updated Aug 24, 2026

Denial of service in Outsystems Platform Server 11.18.1.37828 allows remote attackers to hang the server with slow HTTP POST bodies. The HTTP listener keeps many connections open while their declared Content-Length remains unsatisfied, allowing slow body fragments to exhaust server resources. The attack requires numerous concurrent unauthenticated connections; the researcher reports that fewer than 500 stopped the API, dashboard, and IIS pages from responding, while the supplier states that it could not reproduce the behavior.

CVSS severity7.5
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Outsystems Platform Server 11.18.1.37828 allows remote attackers to hang the server with slow HTTP POST bodies. The HTTP listener keeps many connections open while their declared Content-Length remains unsatisfied, allowing slow body fragments to exhaust server resources. The attack requires numerous concurrent unauthenticated connections; the researcher reports that fewer than 500 stopped the API, dashboard, and IIS pages from responding, while the supplier states that it could not reproduce the behavior.

The record

CVE
CVE-2025-61258
Published
Dec 9, 2025
Updated
Aug 24, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-444, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2BalwurkCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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