CVE-2020-24939: Prototype pollution in Stampit supermixer 1.0.3 allows an attacker to modify the prototype of a base object wh

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-24939 is a high-severity flaw (CVSS 7.5) affecting supermixer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Prototype pollution in Stampit supermixer 1.0.3 allows an attacker to modify the prototype of a base object which can vary in severity depending on the implementation.

Why this priority

High 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-1321
Published	2021-06-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: stampit

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

Am I affected?

Timeline

2021-06-16 16:15 UTCPublished CVE record published
2026-06-17 03:06 UTCUpdated Record last modified

stampit supermixer DOWNGRADE

Affected: 1.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.3 (Debian / Ubuntu)

apt-cache madison supermixer sudo apt install supermixer=<VERSION_BEFORE_1.0.3> sudo apt-mark hold supermixer

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

dnf --showduplicates list supermixer sudo dnf downgrade supermixer-<VERSION_BEFORE_1.0.3> sudo dnf versionlock add supermixer

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-2020-24939?

supermixer: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-24939 being exploited?

CVE-2020-24939 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-2020-24939 affect?

CVE-2020-24939 affects supermixer. Severity is high (CVSS 7.5). Prototype pollution in Stampit supermixer 1.0.3 allows an attacker to modify the prototype of a base object which can vary in severity depending on the implementation.

How urgent is CVE-2020-24939?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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