CVE-2021-37451: Cross Site Scripting (XSS) exists in NCH IVM Attendant v5.12 and earlier via /msglist?mbx= (reflected).

Q: How do I fix CVE-2021-37451?

ivm attendant: upgrade to newer than 5.12. Exact commands for each OS are on this page.

Q: Is CVE-2021-37451 being exploited?

CVE-2021-37451 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-2021-37451 affect?

CVE-2021-37451 affects ivm attendant. Severity is medium (CVSS 5.4). Cross Site Scripting (XSS) exists in NCH IVM Attendant v5.12 and earlier via /msglist?mbx= (reflected).

Q: How urgent is CVE-2021-37451?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2021-37451 is a medium-severity flaw (CVSS 5.4) affecting ivm attendant. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) exists in NCH IVM Attendant v5.12 and earlier via /msglist?mbx= (reflected).

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-07-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nchsoftware

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

Am I affected?

Timeline

2021-07-25 21:15 UTCPublished CVE record published
2026-06-17 04:00 UTCUpdated Record last modified

nchsoftware ivm attendant UPGRADE

Affected: <= 5.12

Fixed in: newer than 5.12

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ivm-attendant || rpm -q ivm-attendant || ivm-attendant --version

2. UPGRADE to newer than 5.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ivm-attendant

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ivm-attendant

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-2021-37451?

ivm attendant: upgrade to newer than 5.12. Exact commands for each OS are on this page.

Is CVE-2021-37451 being exploited?

CVE-2021-37451 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-2021-37451 affect?

CVE-2021-37451 affects ivm attendant. Severity is medium (CVSS 5.4). Cross Site Scripting (XSS) exists in NCH IVM Attendant v5.12 and earlier via /msglist?mbx= (reflected).

How urgent is CVE-2021-37451?

Priority 36/100. Public exploit reference

Related CVEs

CVE-2021-37450 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH IVM Attendant v5.12 and earlier via /ogmprop?id= (reflected).
CVE-2021-37449 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH IVM Attendant v5.12 and earlier via /ogmlist?folder= (reflected).
CVE-2021-37448 MEDIUM 5.4 UPGRADE Cross Site Scripting (XSS) exists in NCH IVM Attendant v5.12 and earlier via the Mailbox name (stored).
CVE-2021-37444 HIGH 8.8 UPGRADE NCH IVM Attendant v5.12 and earlier suffers from a directory traversal weakness upon uploading plugins in a ZI
CVE-2021-37443 HIGH 8.1 UPGRADE NCH IVM Attendant v5.12 and earlier allows path traversal via the logdeleteselected check0 parameter for file

References

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