CVE-2024-33893: Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 are vulnerable to XSS when

Q: How do I fix CVE-2024-33893?

ewon cosy\+ firmware: upgrade to newer than 22.1s3. Exact commands for each OS are on this page.

Q: Is CVE-2024-33893 being exploited?

CVE-2024-33893 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-2024-33893 affect?

CVE-2024-33893 affects ewon cosy\+ firmware. Severity is medium (CVSS 6.1). Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 are vulnerable to XSS when displaying the logs due to improper input sanitization. This is fixed in version 21.2s10 and 22.1s3.

Q: How urgent is CVE-2024-33893?

Priority 40/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2024-33893 is a medium-severity flaw (CVSS 6.1) affecting ewon cosy\+ firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 are vulnerable to XSS when displaying the logs due to improper input sanitization. This is fixed in version 21.2s10 and 22.1s3.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-08-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hms-networks

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

Am I affected?

Timeline

2024-08-02 18:16 UTCPublished CVE record published
2026-06-17 07:32 UTCUpdated Record last modified

hms-networks ewon cosy\+ firmware UPGRADE

Affected: >= 21.0 and <= 21.2s10 · >= 22.0 and <= 22.1s3

Fixed in: newer than 22.1s3

Safe to downgrade to: a release before 21.0

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-2024-33893?

ewon cosy\+ firmware: upgrade to newer than 22.1s3. Exact commands for each OS are on this page.

Is CVE-2024-33893 being exploited?

CVE-2024-33893 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-2024-33893 affect?

CVE-2024-33893 affects ewon cosy\+ firmware. Severity is medium (CVSS 6.1). Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 are vulnerable to XSS when displaying the logs due to improper input sanitization. This is fixed in version 21.2s10 and 22.1s3.

How urgent is CVE-2024-33893?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2024-33897 CRITICAL 9.1 UPGRADE A compromised HMS Networks Cosy+ device could be used to request a Certificate Signing Request from Talk2m for
CVE-2024-33896 HIGH 7.2 UPGRADE Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 are vulnerable to code inj
CVE-2024-33895 MEDIUM 6.6 UPGRADE Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 use a unique key to encryp
CVE-2024-33894 HIGH 8.8 UPGRADE Insecure Permission vulnerability in Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x be
CVE-2024-33892 HIGH 7.5 UPGRADE Insecure Permissions vulnerability in Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x b

References

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