CVE-2021-21957Public exploit

Local privilege escalation via writable service binaries

Published Dec 8, 2021 · Updated Aug 3, 2024

Privilege escalation in Ocean Data Systems Dream Report Remote Connector 20.2.16900.0 allows local users to execute privileged code. The default installation grants Everyone full control over Rtm.exe, Rdxa.exe, and their System directory, enabling service-binary replacement or malicious DLL sideloading. A local low-privileged user must modify those files; execution initially gains the service account context and can reach NT SYSTEM through SeImpersonatePrivilege.

CVSS severity8.8
High
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Ocean Data Systems Dream Report Remote Connector 20.2.16900.0 allows local users to execute privileged code. The default installation grants Everyone full control over Rtm.exe, Rdxa.exe, and their System directory, enabling service-binary replacement or malicious DLL sideloading. A local low-privileged user must modify those files; execution initially gains the service account context and can reach NT SYSTEM through SeImpersonatePrivilege.

The record

CVE
CVE-2021-21957
Published
Dec 8, 2021
Updated
Aug 3, 2024
Vendor
Ocean Data Systems
Product
Dream Report Remote Connector
Classifications
CWE-276, T1574.001, T1574.010
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Dream Report ODS Remote Connector 20.2.16900.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Ocean Data Systems · Dream Report Remote Connectorversion=Dream Report ODS Remote Connector 20.2.16900.0

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8Cisco TalosCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1574.001DLL Search Order Hijacking
T1574.010Services File Permissions Weakness

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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