CVE-2021-37464: In NCH Quorum v2.03 and earlier, XSS exists via Conference Description (stored).

Q: How do I fix CVE-2021-37464?

quorum: upgrade to newer than 2.03. Exact commands for each OS are on this page.

Q: Is CVE-2021-37464 being exploited?

CVE-2021-37464 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-2021-37464 affect?

CVE-2021-37464 affects quorum. Severity is medium (CVSS 5.4). In NCH Quorum v2.03 and earlier, XSS exists via Conference Description (stored).

Q: How urgent is CVE-2021-37464?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2021-37464 is a medium-severity flaw (CVSS 5.4) affecting quorum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In NCH Quorum v2.03 and earlier, XSS exists via Conference Description (stored).

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 52%)
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 quorum UPGRADE

Affected: <= 2.03

Fixed in: newer than 2.03

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.03 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade quorum

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-2021-37464?

quorum: upgrade to newer than 2.03. Exact commands for each OS are on this page.

Is CVE-2021-37464 being exploited?

CVE-2021-37464 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-2021-37464 affect?

CVE-2021-37464 affects quorum. Severity is medium (CVSS 5.4). In NCH Quorum v2.03 and earlier, XSS exists via Conference Description (stored).

How urgent is CVE-2021-37464?

Priority 36/100. Public exploit reference

Related CVEs

CVE-2021-37467 MEDIUM 5.4 UPGRADE In NCH Quorum v2.03 and earlier, XSS exists via /conferencebrowseuploadfile?confid= (reflected).
CVE-2021-37466 MEDIUM 5.4 UPGRADE In NCH Quorum v2.03 and earlier, XSS exists via /conference?id= (reflected).
CVE-2021-37465 MEDIUM 5.4 UPGRADE In NCH Quorum v2.03 and earlier, XSS exists via /uploaddoc?id= (reflected).
CVE-2021-37463 MEDIUM 5.4 UPGRADE In NCH Quorum v2.03 and earlier, XSS exists via User Display Name (stored).
CVE-2021-37452 MEDIUM 5.5 UPGRADE NCH Quorum v2.03 and earlier allows local users to discover cleartext login information relating to users by r

References

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