CVE-2019-3951: Advantech WebAccess before 8.4.3 allows unauthenticated remote attackers to execute arbitrary code or cause a

Q: How do I fix CVE-2019-3951?

webaccess: upgrade to 8.4.3. Exact commands for each OS are on this page.

Q: Is CVE-2019-3951 being exploited?

CVE-2019-3951 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-3951 affect?

CVE-2019-3951 affects webaccess. Severity is critical (CVSS 9.8). Advantech WebAccess before 8.4.3 allows unauthenticated remote attackers to execute arbitrary code or cause a denial of service (memory corruption) due to a stack-based buffer overflow when handling IOCTL 70533 RPC messages.

Q: How urgent is CVE-2019-3951?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-3951 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.

Advantech WebAccess before 8.4.3 allows unauthenticated remote attackers to execute arbitrary code or cause a denial of service (memory corruption) due to a stack-based buffer overflow when handling IOCTL 70533 RPC messages.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.6% (top 11%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2019-12-12
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

2019-12-12 21:15 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

advantech webaccess UPGRADE

Affected: < 8.4.3

Fixed in: 8.4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 8.4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webaccess

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webaccess

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2019-3951?

webaccess: upgrade to 8.4.3. Exact commands for each OS are on this page.

Is CVE-2019-3951 being exploited?

CVE-2019-3951 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-2019-3951 affect?

CVE-2019-3951 affects webaccess. Severity is critical (CVSS 9.8). Advantech WebAccess before 8.4.3 allows unauthenticated remote attackers to execute arbitrary code or cause a denial of service (memory corruption) due to a stack-based buffer overflow when handling IOCTL 70533 RPC messages.

How urgent is CVE-2019-3951?

Priority 67/100. Critical severity; 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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