CVE-2019-18894Public exploit

Code execution via Bank Mode flag injection

Published Jan 13, 2020 · Updated Aug 5, 2024

OS command injection in Avast Premium Security 19.8.2393 allows context-dependent attackers to execute commands through Bank Mode requests. The SWITCH_TO_SAFEZONE handler accepts whitespace in a nominally HTTP or HTTPS URL and passes trailing text to AvastBrowser.exe as command-line flags. Code able to reach the localhost service on port 27275, such as a compromised browser extension, can supply --utility-cmd-prefix and launch processes with the logged-in account's privileges.

CVSS severity7.8
High
EPSS probability1.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Avast Premium Security 19.8.2393 allows context-dependent attackers to execute commands through Bank Mode requests. The SWITCH_TO_SAFEZONE handler accepts whitespace in a nominally HTTP or HTTPS URL and passes trailing text to AvastBrowser.exe as command-line flags. Code able to reach the localhost service on port 27275, such as a compromised browser extension, can supply --utility-cmd-prefix and launch processes with the logged-in account's privileges.

The record

CVE
CVE-2019-18894
Published
Jan 13, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.3NVDAV:N/AC:M/Au:N/C:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1203Exploitation for Client Execution

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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