CVE-2019-5153Public exploitNetwork attack vector

Authenticated code execution via unbounded username formatting

Published Feb 25, 2020 · Updated Aug 4, 2024

Stack-based buffer overflow in Moxa AWK-3131A firmware 1.13 allows remote authenticated users to execute code via an imported configuration. During user-account validation, iw_configbyINI passes an oversized username to sprintf, which writes the error message into a fixed stack buffer without bounds checking. A low-privilege account that can import a crafted configuration can overwrite the saved return address and control execution flow.

CVSS severity9.9
Critical
EPSS probability4.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Moxa AWK-3131A firmware 1.13 allows remote authenticated users to execute code via an imported configuration. During user-account validation, iw_configbyINI passes an oversized username to sprintf, which writes the error message into a fixed stack buffer without bounds checking. A low-privilege account that can import a crafted configuration can overwrite the saved return address and control execution flow.

The record

CVE
CVE-2019-5153
Published
Feb 25, 2020
Updated
Aug 4, 2024
Vendor
Moxa
Product
AWK-3131A Series
Classifications
CWE-787, CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=Moxa AWK-3131A Firmware version 1.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moxa · AWK-3131A Seriesversion=Moxa AWK-3131A Firmware version 1.13

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.9Cisco TalosCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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