CVE-2020-10638: Advantech WebAccess Node, Version 8.4.4 and prior, Version 9.0.0

Q: How do I fix CVE-2020-10638?

webaccess: upgrade to newer than 8.4.4. Exact commands for each OS are on this page.

Q: Is CVE-2020-10638 being exploited?

CVE-2020-10638 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-2020-10638 affect?

CVE-2020-10638 affects webaccess. Severity is critical (CVSS 9.8). Advantech WebAccess Node, Version 8.4.4 and prior, Version 9.0.0. Multiple heap-based buffer overflow vulnerabilities exist caused by a lack of proper validation of the length of user-supplied data, which may allow remote code execution.

Q: How urgent is CVE-2020-10638?

Priority 63/100. Critical severity; EPSS top 6%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-10638 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 Node, Version 8.4.4 and prior, Version 9.0.0. Multiple heap-based buffer overflow vulnerabilities exist caused by a lack of proper validation of the length of user-supplied data, which may allow remote code execution.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited
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	7.1% (top 6%)
CISA exploited list	No
Weakness	CWE-122, CWE-787
Published	2020-05-08
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: advantech

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

Am I affected?

Timeline

2020-05-08 12:15 UTCPublished CVE record published
2026-06-17 02:48 UTCUpdated Record last modified

advantech webaccess UPGRADE

Affected: <= 8.4.4 · 9.0.0

Fixed in: newer than 8.4.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 8.4.4 (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-2020-10638?

webaccess: upgrade to newer than 8.4.4. Exact commands for each OS are on this page.

Is CVE-2020-10638 being exploited?

CVE-2020-10638 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-2020-10638 affect?

CVE-2020-10638 affects webaccess. Severity is critical (CVSS 9.8). Advantech WebAccess Node, Version 8.4.4 and prior, Version 9.0.0. Multiple heap-based buffer overflow vulnerabilities exist caused by a lack of proper validation of the length of user-supplied data, which may allow remote code execution.

How urgent is CVE-2020-10638?

Priority 63/100. Critical severity; EPSS top 6%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

Advantech vulnerabilities

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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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