CVE-2020-24990: An issue was discovered in QSC Q-SYS Core Manager 8.2.1

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2020-24990 is a high-severity flaw (CVSS 7.5) affecting q-sys core manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in QSC Q-SYS Core Manager 8.2.1. By utilizing the TFTP service running on UDP port 69, a remote attacker can perform a directory traversal and obtain operating system files via a TFTP GET request, as demonstrated by reading /etc/passwd or /proc/version.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.7% (top 10%)
CISA exploited list	No
Weakness	CWE-22
Published	2020-10-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: qsc

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

Am I affected?

Timeline

2020-10-28 19:15 UTCPublished CVE record published
2026-06-17 03:06 UTCUpdated Record last modified

qsc q-sys core manager DOWNGRADE

Affected: 8.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.2.1

1. Check installed version

apt-cache policy q-sys-core-manager || rpm -q q-sys-core-manager || q-sys-core-manager --version

2. No fixed release: DOWNGRADE to a release before 8.2.1 (Debian / Ubuntu)

apt-cache madison q-sys-core-manager sudo apt install q-sys-core-manager=<VERSION_BEFORE_8.2.1> sudo apt-mark hold q-sys-core-manager

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list q-sys-core-manager sudo dnf downgrade q-sys-core-manager-<VERSION_BEFORE_8.2.1> sudo dnf versionlock add q-sys-core-manager

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-24990?

q-sys core manager: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-24990 being exploited?

CVE-2020-24990 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-2020-24990 affect?

CVE-2020-24990 affects q-sys core manager. Severity is high (CVSS 7.5). An issue was discovered in QSC Q-SYS Core Manager 8.2.1. By utilizing the TFTP service running on UDP port 69, a remote attacker can perform a directory traversal and obtain operating system files via a TFTP GET request, as demonstrated by

How urgent is CVE-2020-24990?

Priority 54/100. High severity; Remotely exploitable, no login, no user action

References

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