CVE-2025-6811: Mescius ActiveReports.NET TypeResolutionService Deserialization of Untrusted Data Remote Code Execution Vulner

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-6811 is a critical-severity flaw (CVSS 9.8) affecting activereports.net. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mescius ActiveReports.NET TypeResolutionService Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Mescius ActiveReports.NET. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the TypeResolutionService class. The iss

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-502
Published	2025-07-07
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: mescius

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-07-07 15:15 UTCPublished CVE record published
2026-06-17 10:02 UTCUpdated Record last modified

mescius activereports.net DOWNGRADE

Affected: 18.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 18.1.1

1. Check installed version

apt-cache policy activereports.net || rpm -q activereports.net || activereports.net --version

2. No fixed release: DOWNGRADE to a release before 18.1.1 (Debian / Ubuntu)

apt-cache madison activereports.net sudo apt install activereports.net=<VERSION_BEFORE_18.1.1> sudo apt-mark hold activereports.net

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

dnf --showduplicates list activereports.net sudo dnf downgrade activereports.net-<VERSION_BEFORE_18.1.1> sudo dnf versionlock add activereports.net

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-2025-6811?

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

Is CVE-2025-6811 being exploited?

CVE-2025-6811 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-2025-6811 affect?

CVE-2025-6811 affects activereports.net. Severity is critical (CVSS 9.8). Mescius ActiveReports.NET TypeResolutionService Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Mescius ActiveReports.N

How urgent is CVE-2025-6811?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-6810 CRITICAL 9.8 DOWNGRADE Mescius ActiveReports.NET ReadValue Deserialization of Untrusted Data Remote Code Execution Vulnerability

References

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