CVE-2021-27197Public exploitNetwork attack vector

Arbitrary file write via unvalidated ActiveX method

Published Feb 12, 2021 · Updated Aug 3, 2024

Arbitrary file write in Pelco Digital Sentry Server before 7.19.67 allows remote attackers to overwrite files through a crafted HTML page. The AppendToTextFile method in DSUtility.dll accepts calls from malicious VBScript through its ActiveX interface without validating the caller's origin. A user must open the crafted page in an ActiveX-capable browser, and the resulting file write is limited to that user's permissions.

CVSS severity8.1
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in Pelco Digital Sentry Server before 7.19.67 allows remote attackers to overwrite files through a crafted HTML page. The AppendToTextFile method in DSUtility.dll accepts calls from malicious VBScript through its ActiveX interface without validating the caller's origin. A user must open the crafted page in an ActiveX-capable browser, and the resulting file write is limited to that user's permissions.

The record

CVE
CVE-2021-27197
Published
Feb 12, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-346, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 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?

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

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
8.8NIST NVDAV:N/AC:M/Au:N/C:N/I:C/A:C

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-346Origin Validation Error
T1204.001User Execution: Malicious Link

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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