CVE-2019-3975: Stack-based buffer overflow in Advantech WebAccess/SCADA 8.4.1 allows a remote, unauthenticated attacker to ex

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-3975 is a critical-severity flaw (CVSS 9.8) affecting webaccess. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in Advantech WebAccess/SCADA 8.4.1 allows a remote, unauthenticated attacker to execute arbitrary code via a crafted IOCTL 70603 RPC message.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-787
Published	2019-09-10
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: advantech

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-09-10 16:15 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

advantech webaccess DOWNGRADE

Affected: 8.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.4.1

1. Check installed version

apt-cache policy webaccess || rpm -q webaccess || webaccess --version

2. No fixed release: DOWNGRADE to a release before 8.4.1 (Debian / Ubuntu)

apt-cache madison webaccess sudo apt install webaccess=<VERSION_BEFORE_8.4.1> sudo apt-mark hold webaccess

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list webaccess sudo dnf downgrade webaccess-<VERSION_BEFORE_8.4.1> sudo dnf versionlock add webaccess

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-3975?

webaccess: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-3975 being exploited?

CVE-2019-3975 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-3975 affect?

CVE-2019-3975 affects webaccess. Severity is critical (CVSS 9.8). Stack-based buffer overflow in Advantech WebAccess/SCADA 8.4.1 allows a remote, unauthenticated attacker to execute arbitrary code via a crafted IOCTL 70603 RPC message.

How urgent is CVE-2019-3975?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Advantech vulnerabilities

Related CVEs

CVE-2023-4215 MEDIUM 6.5 DOWNGRADE Advantech WebAccess version 9.1.3 contains an exposure of sensitive information to an unauthorized actor vulne
CVE-2023-2866 HIGH 7.3 DOWNGRADE If an attacker can trick an authenticated user into loading a maliciously crafted .zip file onto Advantech We
CVE-2021-38408 CRITICAL 9.8 UPGRADE A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused by a lack of
CVE-2021-38389 CRITICAL 9.8 UPGRADE Advantech WebAccess versions 9.02 and prior are vulnerable to a stack-based buffer overflow, which may allow a
CVE-2021-34540 MEDIUM 6.1 DOWNGRADE Advantech WebAccess 8.4.2 and 8.4.4 allows XSS via the username column of the bwRoot.asp page of WADashboard.

References

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