CVE-2020-3927Network attack vector

Arbitrary file deletion via unfiltered API path

Published Feb 3, 2020 · Updated Sep 16, 2024

Arbitrary file deletion in CHANGING ServiSign 1.0.19.0617 and earlier allows remote attackers to delete files through a crafted API parameter. An insecure DLL API accepts a caller-controlled file path without path filtering or access control and deletes the referenced file. No ServiSign authentication is required, but the victim must have the Windows component installed and browse attacker-controlled phishing or advertising content that invokes the API.

CVSS severity8.3
High
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file deletion in CHANGING ServiSign 1.0.19.0617 and earlier allows remote attackers to delete files through a crafted API parameter. An insecure DLL API accepts a caller-controlled file path without path filtering or access control and deletes the referenced file. No ServiSign authentication is required, but the victim must have the Windows component installed and browse attacker-controlled phishing or advertising content that invokes the API.

The record

CVE
CVE-2020-3927
Published
Feb 3, 2020
Updated
Sep 16, 2024
Vendor
CHANGING Information Technology Inc.
Product
ServiSign
Classifications
CWE-552, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=0 <=1.0.19.0617

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CHANGING Information Technology Inc. · ServiSignversion=0 <=1.0.19.0617

Published CVSS scores

8.5NIST NVDAV:N/AC:L/Au:N/C:N/I:C/A:P
8.3TWCERT/CCCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-552Files or Directories Accessible to External Parties
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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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