CVE-2019-5619Public exploitNetwork attack vector

Code execution via oversized FTP LIST response

Published Apr 29, 2020 · Updated Sep 16, 2024

Stack buffer overflow in AASync 2.2.1.0 allows remote attackers to execute code through a crafted FTP LIST response. Its FTP client copies an oversized directory-listing filename into a fixed stack buffer, overwriting the SEH record during LIST-response processing. Exploitation requires the Windows client to connect to an attacker-controlled FTP server and request a directory listing; successful exploitation runs code in the client process.

CVSS severity9.8
Critical
EPSS probability4.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in AASync 2.2.1.0 allows remote attackers to execute code through a crafted FTP LIST response. Its FTP client copies an oversized directory-listing filename into a fixed stack buffer, overwriting the SEH record during LIST-response processing. Exploitation requires the Windows client to connect to an attacker-controlled FTP server and request a directory listing; successful exploitation runs code in the client process.

The record

CVE
CVE-2019-5619
Published
Apr 29, 2020
Updated
Sep 16, 2024
Vendor
AASync.com
Product
AASync
Classifications
CWE-787, CWE-121, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 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=2.2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AASync.com · AASyncversion=2.2.1.0

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

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-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
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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