CVE-2021-40350: webctrl.cgi.elf on Christie Digital DWU850-GS V06.46 devices allows attackers to perform any desired action vi

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2021-40350 is a critical-severity flaw (CVSS 9.8) affecting dwu850-gs firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

webctrl.cgi.elf on Christie Digital DWU850-GS V06.46 devices allows attackers to perform any desired action via a crafted query containing an unspecified Cookie header. Authentication bypass can be achieved by including an administrative cookie that the device does not validate.

Why this priority

Critical severity
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	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-287
Published	2021-09-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: christiedigital

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

Am I affected?

Timeline

2021-09-01 15:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

christiedigital dwu850-gs firmware MITIGATE

Affected: 06.46

Fixed in: no fixed release known

Safe to downgrade to: a release before 06.46

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2021-40350?

dwu850-gs firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-40350 being exploited?

CVE-2021-40350 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-2021-40350 affect?

CVE-2021-40350 affects dwu850-gs firmware. Severity is critical (CVSS 9.8). webctrl.cgi.elf on Christie Digital DWU850-GS V06.46 devices allows attackers to perform any desired action via a crafted query containing an unspecified Cookie header. Authentication bypass can be achieved by including an administrative co

How urgent is CVE-2021-40350?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs