CVE-2025-61258: Outsystems Platform Server 11.18.1.37828 allows attackers to cause a denial of service via a crafted content-l

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HIGH 7.5REMOTEDOWNGRADE

CVE-2025-61258 is a high-severity flaw (CVSS 7.5) affecting platform server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Outsystems Platform Server 11.18.1.37828 allows attackers to cause a denial of service via a crafted content-length value mismatching the body length. NOTE: the Supplier indicates that they are unable to reproduce this.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-444
Published	2025-12-09
Last modified	2026-08-24

Publisher (CNA): MITRE · Vendor: outsystems

Last updated 2026-08-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-09 18:15 UTCPublished CVE record published
2026-08-24 14:16 UTCUpdated Record last modified

outsystems platform server DOWNGRADE

Affected: 11.18.1.37828

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.18.1.37828

1. Check installed version

apt-cache policy platform-server || rpm -q platform-server || platform-server --version

2. No fixed release: DOWNGRADE to a release before 11.18.1.37828 (Debian / Ubuntu)

apt-cache madison platform-server sudo apt install platform-server=<VERSION_BEFORE_11.18.1.37828> sudo apt-mark hold platform-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list platform-server sudo dnf downgrade platform-server-<VERSION_BEFORE_11.18.1.37828> sudo dnf versionlock add platform-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-61258?

platform server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-61258 being exploited?

CVE-2025-61258 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-61258 affect?

CVE-2025-61258 affects platform server. Severity is high (CVSS 7.5). Outsystems Platform Server 11.18.1.37828 allows attackers to cause a denial of service via a crafted content-length value mismatching the body length. NOTE: the Supplier indicates that they are unable to reproduce this.

How urgent is CVE-2025-61258?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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