CVE-2020-1986

Recurring login crash via unvalidated proc path

Published Apr 8, 2020 · Updated Sep 16, 2024

Improper input validation in all Secdo versions for Windows allows local users to crash the system on every login through disk-root access. Secdo fails to validate the root-level C:\proc path before using it during login, so attacker-controlled folder state triggers the crash. Exploitation requires an authenticated local account with create-folder or append-data access at C:; the reported effect is availability loss only.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in all Secdo versions for Windows allows local users to crash the system on every login through disk-root access. Secdo fails to validate the root-level C:\proc path before using it during login, so attacker-controlled folder state triggers the crash. Exploitation requires an authenticated local account with create-folder or append-data access at C:; the reported effect is availability loss only.

The record

CVE
CVE-2020-1986
Published
Apr 8, 2020
Updated
Sep 16, 2024
Vendor
Secdo
Product
Secdo
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 8, 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=all versions

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Secdo · Secdoversion=all versions

Published CVSS scores

4.9NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:C
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Palo Alto NetworksCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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